The market that turns some people back
On a Saturday morning in Grantham Marketplace, the stalls are up before nine. Around thirty regular traders set out fruit, clothing, tools and food across a square framed by Georgian and Victorian frontages — a working market in a constrained historic space, the buildings close enough on all sides to hold the air still. What that also holds is noise and exhaust.
Until recently, mains electricity was unavailable to the traders. Power came from diesel generators running through the morning shift. Generators of that type commonly operate above 80 decibels — a level associated with tinnitus, noise-induced hearing loss, and the kind of low-grade fatigue that accumulates before a person can name why they feel worse than when they arrived. At ground level, diesel exhaust emissions — classified by the International Agency for Research on Cancer as a Group 1 human carcinogen — concentrate in the same pedestrian zone where people browse, chat, and queue. In a tight historic square, with no clear exit to open air, both the noise and the fumes have nowhere much to go.
For many visitors this is background inconvenience. For others — people who are autistic or neurodivergent, people with asthma or other respiratory conditions, people for whom sensory input compounds rather than fades — it is something closer to a barrier. Not a wall, and not a policy. Just a Saturday morning that isn't for them. That is a design outcome, even when no one designed it that way.
What South Kesteven decided — and why it matters locally
In February 2026, South Kesteven District Council began installing permanent mains electricity in Grantham Marketplace and Narrow Westgate — work that will allow traders and event organisers to plug in directly and switch off diesel generators for good. The project is funded through the government's Future High Streets Fund, drawing on a £5.2 million allocation awarded to the council in 2021; the specific power-and-public-realm package is costed at £880,000 and includes new planters, benches and cycle parking alongside the electrical infrastructure.
The council's own language is telling. Its press release names 'the need for noisy generators' as the problem being solved; the broader description from the scheme adds 'environmentally damaging' to that framing. Noise and environmental harm — not disability, not sensory access, not neurodivergent inclusion — are the terms in which the decision was made and communicated.
That is not a criticism. It is a funded, in-progress infrastructure decision with a clear rationale and a verifiable scope. The question worth asking is what else the same decision achieves — and for whom — that its framing does not yet name.
What generators do to a body — and to a brain
The Health and Safety Executive sets a workplace exposure limit for diesel exhaust at 0.05 milligrams of elemental carbon per cubic metre of air. That figure applies to enclosed workplaces; there is no equivalent standard for open-air markets. Short-term exposure causes eye and respiratory irritation — for people with asthma, COPD, or existing lung conditions, those effects are more acute. Breathing diesel particulate in a constrained historic square, with buildings on three sides holding the air still, is not comparable to a brief encounter on an open road.
For people with sensory processing differences, a separate mechanism operates — and it is worth being precise about what that mechanism is. The National Autistic Society is explicit on this point: sensory processing differences in autistic people are not defects of the ears or the eyes. They are differences in how the brain processes sensory information. A running generator does not create difficulty at the level of the ear canal; it creates difficulty further along, where the brain integrates continuous mechanical drone with diesel smell, crowd movement, and the general unpredictability of an outdoor market. Those signals compound. For many autistic or neurodivergent people, the combination tips from manageable into overwhelming — not because the stimuli are unusually intense, but because of how they are processed together.
Autistica reports that approximately nine in ten autistic people experience sensory differences. Savills, drawing on neurodiversity-in-planning research, estimates that 15 to 20 per cent of the population is neurodivergent in some form. Those are not figures that describe a narrow edge case. On any given Saturday in Grantham Marketplace, they describe a meaningful share of the people who might, or might not, be there.
The access gap that ramps and dropped kerbs don't reach
Ramps, dropped kerbs, and step-free routes address one category of barrier: the kind that stops a wheelchair or pushchair from moving through a space. They are necessary, hard-won, and still incompletely delivered across the UK's historic market towns. But they do not address what happens after someone has arrived — the continuous mechanical noise, the diesel smell, the visual unpredictability, the absence of anywhere quiet to pause.
Finnigan et al., writing in MDPI Land in 2024, provide qualitative evidence specifically from outdoor built environments. Their findings map a consistent set of barriers for people with sensory sensitivities: unpredictable inescapable noise, olfactory pollution, the lack of refuge points, and unclear wayfinding. These are not hypothetical conditions — they describe a busy Saturday market with reasonable accuracy. The researchers note, though, that outdoor public spaces remain less studied than indoor ones for sensory effects, meaning the evidence base is real but patchy, and the scale of the problem likely understated.
What fills that gap in practice is avoidance. People who find a space too overwhelming simply do not go. Autistica's NeuInsight initiative is direct about this: the goal of sensory-inclusive design is not to help individuals cope better, identify the quietest hour to visit, or navigate around barriers by other means. It is to remove barriers structurally, so that participation is possible on equal terms. Avoidance is not a personal solution — it is what inadequate design costs people who already face more obstacles than most.
What sensory-inclusive design looks like in a market town
Standards do exist, and some are specific enough to be useful. PAS 6463 — 'Design for the Mind' — is the British Standards Institution's first guidance document addressing neurodiversity and the built environment. Its core principles include sensory zoning (separating high-stimulation areas from calmer ones), predictable legibility (clear, consistent wayfinding that reduces decision fatigue), and noise calming. None of these are indoor-only principles; all apply, in theory, to outdoor market settings.
Historic England's sensory map framework, updated in 2024, was designed precisely for heritage and public spaces. It asks managers to identify conflicts between sensory experiences — a loud zone intruding on an otherwise quieter area, a busy thoroughfare cutting across a potential rest point — and to plan seating, pause points, and visitor information around those findings. A constrained historic market square is exactly the type of setting this framework addresses.
There are working UK precedents in comparable contexts. Doncaster's Nook Stops — dedicated quiet pods introduced in partnership with Autism Plus — and Colchester's 'Calm at the Castle' sessions, which turn off loud interactive displays and open designated quiet rooms at a heritage site, show that market-town public spaces can make meaningful adaptations without rebuilding from scratch.
Grantham's enclosed square, listed surroundings, and weekly market dynamic limit what is permanently achievable. But the most transferable principle from PAS 6463 is also the least expensive: predictable legibility — clear, consistent information about what to expect in the space, available before someone arrives, so the decision to come is not itself a sensory gamble.
A generator-free market is a starting point, not a finish line
Switching off diesel generators in February 2026 was the right call, and it is worth saying so plainly. It removes a noise source that regularly exceeds 80 dB, eliminates diesel exhaust from a Group 1 carcinogen, and makes the square meaningfully less hostile to people with sensory sensitivities — without requiring anyone to ask for a reasonable adjustment or plan their Saturday around a machine's schedule. That is progress, and it is concrete.
But it is a floor, not a finish line. The space that remains after the generators go silent may still carry unpredictable crowd noise, no quiet retreats, and the same absence of clear wayfinding that PAS 6463 identifies as a core barrier. The structural gaps that Autistica names — the ones that push people toward avoidance rather than participation — do not disappear with the power cables.
Grantham's population skews older than the national average, and while no local data directly links that to rates of acquired hearing loss or respiratory sensitivity, the inference is reasonable: sensory-inclusive design is not only a neurodivergence question. It concerns anyone whose capacity to tolerate a noisy, polluted environment has narrowed over time.
The useful question for South Kesteven is not whether the market is now more accessible — it is. The question worth keeping open is: who still cannot use this space comfortably, and what would it actually take to change that?