London’s three national cancer screening programmes — breast, cervical and bowel — are designed to work the same way everywhere in England: eligible residents are invited by post, and a GP-registered address is the trigger. In practice, the borough where that address sits changes the odds of being screened enormously. NHS screening data reviewed for this briefing put overall cancer screening uptake by London borough anywhere from the mid-40s to the high-70s in percentage terms, a spread wide enough that two Londoners with the identical risk profile can have very different chances of an early diagnosis, purely on the basis of postcode.
This briefing sets out what the borough-level pattern actually looks like across all three programmes, where the gap is widest, and what is known about why.
London as a whole is below the national line
Before looking borough by borough, it is worth establishing that London already lags the rest of England on all three screening programmes. Coverage across breast, cervical and bowel screening in London runs at roughly 60–65 per cent, up to ten percentage points below the equivalent rate elsewhere in the country. Breast screening in London has not reached the NHS’s 70 per cent minimum standard for a quarter of a century, and first-invite uptake sits at around 55.6 per cent against a national average of 62.5 per cent. Bowel screening in London has run at roughly 58 per cent, below the NHS’s 60 per cent achievable threshold. Cervical screening tells the same story: London screened around 58 per cent of eligible women aged 25–49 in 2023–24, roughly eight points below the national average and around thirteen points below the best-performing English region, and coverage has been declining across the capital for the past decade.
That citywide average, though, hides a much bigger spread once you break it down by borough.
Where uptake is lowest
A small group of inner-London boroughs consistently sit at the bottom of the table across all three programmes. Kensington and Chelsea is the clearest example: its breast screening rate for women aged 53–70 has run at around 46 per cent, roughly sixteen points below the London average and around 24 points below the England average. Cervical screening coverage there sits in the low-to-mid 40s for both the 25–49 and 50–64 age bands — meaning fewer than half of eligible women take up the invitation, against an NHS ambition of 80 per cent coverage. Bowel screening in the borough has been reported at around 53 per cent, among the lowest of any local authority in England.
Westminster shows a similar pattern, with bowel screening uptake close to 52 per cent and cervical screening also below half of eligible women. Tower Hamlets has also been flagged as among the weakest performers across all three programmes, and both Camden and Islington have recorded cervical and bowel screening coverage consistently below the London and England averages, with Camden recording the lowest cervical coverage among north central London boroughs for the 25–49 age group. Outer London is not immune either: Barking and Dagenham’s bowel screening uptake was recorded at 57.4 per cent in 2024, against a national rate of 70.3 per cent.
Where uptake is highest
At the other end of the range, a cluster of outer London boroughs consistently screens a much higher share of eligible residents. Havering has recorded breast screening uptake of around 78 per cent — the highest of any London borough and well above the England average. Bromley’s cervical screening coverage has been reported at just over 71 per cent, the strongest in London, and Bexley has also consistently ranked among the borough’s better performers across the three programmes. Enfield and Haringey both report cervical screening coverage above the London average, and Enfield and Barnet report bowel screening coverage at or above the London average too.
The comparison below sets out the figures referenced in NHS screening data for the boroughs and programmes where a specific rate has been reported; a dash indicates that no comparable figure was available for that combination.
| Area | Breast screening | Cervical screening | Bowel screening |
|---|---|---|---|
| London average | 61% | 58% (ages 25–49) | 58% |
| England average | 69% | — | 70.3% |
| Kensington and Chelsea | 46% | ~43–46% | 53% |
| Westminster | — | <50% | 52% |
| Barking and Dagenham | — | — | 57.4% |
| Havering | 78% | — | — |
| Bromley | — | ~71% | — |
What explains the gap
None of the three screening programmes changes its invitation process by borough, so the variation has to come from somewhere else. The factors most consistently associated with lower uptake in inner London are population mobility (residents moving more often, so invitation letters go to an outdated GP-registered address), a higher proportion of residents using private healthcare and so not engaging with the NHS invitation pathway, and a higher share of second-home ownership or time spent outside the UK in some central boroughs. More broadly, deprivation and ethnicity are strongly associated with lower screening attendance across England, which is part of why the pattern is not simply an inner-versus-outer London divide — some outer boroughs also lag, and some inner boroughs perform well.
What this means in practice is that a borough’s screening rate is not just a health-system statistic; it is a reasonably direct proxy for how easily a resident of that borough can act on an NHS invitation once it lands. A 46 per cent breast screening rate in one borough against 78 per cent thirty minutes away by train is not a difference in risk — it is a difference in whether the system’s outreach is actually reaching people.
Why the borough breakdown matters
National and even London-wide screening statistics are the headline most people see, but they conceal exactly the kind of borough-level gap this briefing has set out. For residents, knowing that a local area sits well below the London average on cervical or bowel screening is a reason to check when the next invitation is due, rather than assume it will simply arrive and be acted upon by default. For anyone planning services or equipment for community-based screening delivery — from mobile units to practice-based testing kit — the borough figures are also the more useful unit of analysis than a city-wide average, because they show precisely where uptake, not just eligibility, is falling short.