Brexit At Ten — The Audit
A connection through “Who really owns it?”: Follow the ownership and control behind infrastructure, money, and information.
Undercurrent · Deep Dive · Technology & Infrastructure · Part V
The Invisible
Grid
You've stared at your phone watching the signal bars disappear — on a train, in a lift, in the middle of a city. You assume it's a technical glitch. It isn't. The UK's mobile infrastructure is shaped far more by a single Treasury decision made in the year 2000 than by anything to do with physics.
TelecomsInfrastructureEconomics5GPolicy
£22.5bn
Raised by government
selling spectrum in 2000
9%
Of UK geographic area
with no 4G coverage
17%
Mobile data gaps
London-Sheffield route
32%
Of EE '5G' connections
that are actually genuine 5G
Every time you lose signal in rural Britain, you are experiencing the downstream consequence of a Treasury decision made in April 2000. The government raised £22.5 billion in a single afternoon. The operators spent so much buying the air that they couldn't afford to build the network.
The network has been playing catch-up ever since.
01
The Hook
The Government Sold the Air
Radio spectrum — the range of electromagnetic frequencies used to carry wireless signals — is a finite natural resource, as fixed in supply as land. You cannot create more of it. Governments own it on behalf of the public and grant the right to use specific frequency bands to whoever they choose. In the late 1990s, the UK government decided to sell those rights to the highest bidder.
The 3G spectrum auction ran for 150 rounds over seven weeks, from 6 March to 27 April 2000. It was designed by two economists — Ken Binmore of University College London and Paul Klemperer of Oxford — and deliberately structured to extract maximum revenue from the bidders.
The Final Bids
Vodafone £5.96 billion
Hutchison (Three) £4.39 billion
Orange £4.10 billion
BT £4.03 billion
One2One (T-Mobile) £4.00 billion
Total: £22.5 billion (2.5% of UK's annual economic output)
The auction was celebrated as a triumph of economic design. What nobody discussed at the time — and what is still rarely discussed today — is what happened next. Five companies had just spent a combined £22.5 billion acquiring the right to use frequencies. They now had to build the actual network on top of that. The capital was gone. The infrastructure still needed to be funded.
02
The Mechanism
The Auction Trap
The causal chain runs like this: the government designed an auction to maximise revenue → operators paid far more than they expected → their balance sheets were severely strained → capital available for infrastructure investment was reduced → network rollout was slower and less comprehensive than it would otherwise have been → coverage gaps formed that have never fully closed.
The operators were also only required, as a licence condition, to cover 80% of the UK population with 3G. The remaining 20% — disproportionately rural, remote, and economically marginal — was structurally excluded from the outset.
Subsequent Auctions
4G (2013) £2.34 billion
5G (2021) £1.38 billion
Prices fell not because spectrum became less valuable, but because operators had learned from 2000 and bid more conservatively.
International comparison: Sweden took a different approach. Rather than auctioning 3G licences, it ran a "beauty contest" — allocating spectrum based on which operators made the most credible commitments to coverage and service quality. Sweden charged almost nothing for the licences. South Korea, which charged far less than the UK, now has 99% rural 4G coverage and was the first country in the world to launch commercial 5G.
03
Context — The Physics
How Signal Actually Reaches Your Phone
A cell tower is a radio transmitter and receiver. Your phone is also a radio transmitter and receiver. They communicate on specific frequencies, and the choice of frequency determines almost everything about how the signal behaves.
The Fundamental Trade-off
Range vs Data Capacity: Lower frequencies travel further and penetrate solid objects more easily. A 700 MHz signal can travel 15 kilometres from a mast and pass through walls, trees, and building materials with relatively little loss. But lower frequencies carry less data. Higher frequencies carry vastly more data but travel shorter distances and are blocked by almost everything. The 26 GHz millimetre-wave band used for the most advanced 5G can carry enormous amounts of data but barely travels 200 metres and is blocked by a pane of glass.
The "cell" in "cell phone" refers to the geographic cells into which the country is divided, each served by a mast. When you move between cells — driving, on a train — your call is "handed off" from one tower to the next.
Beyond Google
There is also a distinction that most people conflate: coverage and capacity are different things. Coverage is whether a signal reaches you at all. Capacity is how many simultaneous users a single mast can serve. At a football match, a concert, or on New Year's Eve, your phone shows full bars — the signal is there — but nothing loads. The tower has run out of capacity.
Beyond Google
Signal strength follows the inverse square law: double your distance from a mast and signal strength drops to one quarter. This is why the difference between sitting near a window and standing in the middle of a building can be the difference between four bars and zero.
04
Context — The Economics
Why Coverage Gaps Exist:
It's Not Technical, It's Commercial
A macro cell tower costs between £100,000 and £300,000 to build, and between £10,000 and £25,000 per year to operate.
A tower in central London serves hundreds of thousands of users. A tower in a remote Scottish glen might serve 200 people. The capital cost is identical. The revenue is a fraction. The return on investment calculation is not even close.
The Electronic Communications Code, reformed in 2017, was designed to address this by reducing the rent that landowners could charge for hosting masts. The reform reduced some rents by up to 90%. The unintended consequence was that many landowners simply refused to renew lease agreements. Masts were removed. Coverage in some areas got worse as a direct result of legislation designed to improve it.
05
The Mechanism
The Shared Rural Network:
A Workaround for Market Failure
The Shared Rural Network (SRN) is a £1 billion programme — jointly funded by the four mobile operators and the government — designed to address the coverage gaps that the market will never fill commercially.
SRN Milestones
- June 2024: Committed to providing 4G coverage to 88% of the UK's geographic area — target met
- January 2027: Next milestone is 89.2%
- Outstanding: 260 identified "total not-spots" — areas with no signal from any operator
The harder truth: Even with the SRN, 9% of the UK's geographic area remains a total 4G not-spot. That is an area larger than Wales with no mobile coverage from anyone.
06
Context — The Train Problem
Why Your Phone Dies on the Train
Train carriages are, from a radio signal perspective, a hostile environment. The metal body of the carriage acts as a partial Faraday cage.
Vehicle Penetration Loss
Modern trains are significantly worse than older ones: metallised windows, installed for thermal insulation, block radio frequencies with particular efficiency. Researchers have measured Vehicle Penetration Loss at between 3 and 28 decibels.
The speed problem compounds the physics problem. At 125 mph, a train moves through a cell tower's coverage area in roughly 30 to 60 seconds. The network must execute a "handoff" every minute or so.
A 2025 Streetwave report measured actual mobile data coverage on the London to Sheffield intercity route. Vodafone provided essential data coverage for 29% of the journey. EE for 26%. Three for 19%. O2 for 17%.
The deeper problem is structural. Improving train connectivity requires cooperation between three separate commercial entities: the train operator, the mobile network operator, and the rolling stock leasing company. None of these three parties directly profits from your phone working on the train.
International comparison: Japan's Shinkansen delivers 86.3% consistent quality connectivity. South Korea's KTX delivers average download speeds of 127.8 Mbps. The difference is not technical — it's that both countries mandated mobile connectivity on rail at a national level.
07
Context — The Hidden Infrastructure
What Happens When You Make a Phone Call
Most people have a vague mental model of mobile calls: your phone talks to a tower, the tower connects to the other person. The reality involves seven distinct steps, multiple commercial entities, a central government database, and infrastructure that spans fibre optic cables, microwave dishes, and data centres.
Beyond Google
Backhaul is the connection between a cell tower and the core network. In cities, backhaul is typically fibre optic cable. In rural areas, it is often microwave links. You can have a 5G mast with a 4G backhaul connection — the phone shows 5G, the data moves at 4G speeds.
Beyond Google
The MVNO model (Mobile Virtual Network Operator) is how Tesco Mobile, Giffgaff, Sky Mobile, and Lyca Mobile exist without owning a single mast. They purchase wholesale access from one of the four network operators and resell it under their own brand.
Beyond Google
Number portability — keeping your number when you switch networks — involves an extra routing step. The call first goes to your old network, which queries a central database, and then re-routes to your new network.
08
So What — 5G
5G: Three Technologies,
One Marketing Campaign
5G is not a single technology. It is a marketing umbrella covering three fundamentally different things.
Low-Band 5G (700–900 MHz)
What most UK users have. It delivers real-world speeds of roughly 50–150 Mbps. It is, in practice, faster 4G.
Mid-Band 5G (3.5 GHz)
The genuine upgrade — 150–400 Mbps — but limited to cities and larger towns.
Millimetre-Wave 5G (26 GHz)
Speeds exceeding 1,000 Mbps, latency below 1 millisecond. It barely exists outside laboratory trials. It works within 200 metres of a mast. Rain degrades it. A human body blocks it.
When a UK phone displays the 5G icon, how often is it actually connected to genuine 5G? For EE, the answer is only 32% of the time.
The icon problem is particularly revealing. Most UK 5G is deployed as "Non-Standalone" (NSA). A March 2025 study found that across all UK operators, 38% of connections displaying the 5G icon were actually 4G connections. The icon is, in a meaningful proportion of cases, a marketing symbol rather than a technical status indicator.
09
The Mechanism
Why the 5G Icon Lies
5G Non-Standalone (NSA) architecture uses the 5G radio access network but relies on the existing 4G core network. Operators display the 5G icon when the phone is associated with a 5G radio cell — regardless of whether the underlying connection is actually delivering 5G performance.
The commercial incentive is clear: showing 5G on the status bar justifies premium 5G plan pricing.
Beyond Google
The 5G conspiracy theories of 2020 had real consequences. During COVID-19 lockdown, almost 90 attacks on mobile masts were reported in the UK. Nearly 50 assaults on telecom engineers were recorded. Some of the attacked towers were 4G masts. The engineers who received death threats were maintaining infrastructure that kept hospitals connected during a national emergency.
What 5G is actually designed for has almost nothing to do with your phone. The real use cases are industrial: factory automation, autonomous vehicle coordination, remote surgical robotics. The marketing campaign arrived approximately a decade before the technology it was advertising.
10
So What
The System Behind Your Signal Bars
The mobile network is not a utility in the way that water or electricity is a utility. It is a patchwork of commercial decisions, regulatory compromises, legacy infrastructure, and competing incentive structures.
Three Types of Failure
Rural coverage: The 9% of the UK that has no 4G coverage is not a technical failure. It is a commercial failure.
Train connectivity: Not a technical failure either. It is a coordination failure.
The 5G situation: The gap between the marketing and the reality is wide enough to be a form of consumer misdirection.
One Takeaway
The UK's mobile infrastructure problems are not primarily technical. They are economic and political: a spectrum auction that prioritised Treasury revenue over network quality, a regulatory framework that allowed operators to exclude 20% of the population, a planning system that makes mast deployment slow, and a fragmented commercial model that leaves train connectivity in the gap between three parties' profit and loss accounts.
The Dinner Party Line
"The UK government made £22.5 billion in a single afternoon in the year 2000 by selling the right to use thin air. The operators spent so much buying the air that they couldn't afford to build the network. That's why 9% of the country still has no signal from anyone. And the 5G icon on your phone? For EE customers, it's actually 4G 68% of the time."
You’ve looked beneath the surface.
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A connection through “Who really owns it?”: Follow the ownership and control behind infrastructure, money, and information.
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