Most locking nuts are not solid metal. There is a steel body doing the work and a thin chrome cap pressed over the outside to make it look tidy, and the two are only held together by that press fit. Water gets between them, the steel underneath rusts and swells, and the cap lifts and distorts. The key then cannot reach the pattern it is supposed to engage with, because there is a layer of loose, expanded chrome in the way. The nut itself is often perfectly sound underneath.
This is a winter problem and Peterborough gets a proper winter. Salt off the parkways gets thrown into the wheels for months and the caps take the worst of it. The remedy is not a bigger hammer on the key. The extraction socket is driven over the whole thing, cap and all, and it bites into the body beneath, so the nut winds out in one piece. A plain nut goes back on to the manufacturer's torque figure, and the job is done wherever the car is standing, out in Werrington or in a yard off the A47.
A lost locking wheel nut key is a small problem with a large consequence. The tyre may only need a repair, but if the wheel will not come off the car is going nowhere, and that is a genuinely bad position on the A1(M). Same tools in Werrington as in Orton, same on every call. Valve in Bretton, balance in Hampton, pressures before we go.

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Peterborough spreads across a set of townships joined by fast parkways, so a car that cannot have a wheel off is a car that cannot get anywhere useful. The extraction gear comes out to it instead, at home in Stanground or in a works car park off the A15, and the wheel is left so an ordinary socket will shift it next winter.
A car in Bretton had a nut whose chrome cover had swollen out of shape. The key would not seat at all. Underneath, the nut was in decent condition and came out cleanly.
An older car in Orton had four nuts in the same state. Doing one and leaving three would only have delayed the next call, so the set came off together.
A booked change in Hampton stopped at the first wheel. The nut was cleared the same afternoon and the tyres went on without anybody rebooking.
Usually because the chrome cap on the nut has lifted and swollen with rust underneath. The pattern the key needs is still there, buried under a layer of distorted metal.
Often not, but it is coming off anyway. A cap that has lifted once will do it again, so a plain nut goes back in its place.
It is the main cause of the ones we see. Months of spray thrown up into the wheel arches is exactly the environment that lifts a pressed on cap.
Werrington, Orton, Bretton, Hampton and the rest are all covered, along with the roads out towards Stamford and Huntingdon.
Plain nuts do not have caps to lift. If you would rather keep a locking set, at least try the key once a year rather than finding out at the roadside.
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