A car parked on a slope behaves differently the moment a wheel leaves the ground. The handbrake holds two wheels rather than four, and once one corner is in the air the whole load shifts onto whatever is left holding it. That is why a wheel change on the climb up Sudbury Hill is a genuinely different job from the same wheel change on flat ground outside a house in Ravenor Park, and it is why chocks go in before the jack rather than after.
If you have stopped on a gradient with a flat, everything useful you can do is small. Leave it in gear, or in park if it is an automatic, handbrake fully on, and turn the wheels in towards the kerb so the kerb becomes the backstop. Then get out and stay out, on the uphill side, off the carriageway. Do not put a jack under it and do not loosen anything while you wait. A fair share of the awkward jobs we get called to are cars that have been half undone by somebody standing in the rain, and a car sitting on loosened nuts on a hill is a worse object than a car sitting on a flat tyre. When we arrive it gets chocked at the opposite corner and lifted from the manufacturer's proper jacking point, which is what keeps the whole thing boring.
Do not drive it. That is the short version, and it saves more money than anything else on this page. A few hundred yards on a flat destroys the sidewall, and quite often the rim as well, which turns a repair into a tyre and a wheel. That applies double if you are thinking of nursing it off the A4127 to somewhere more convenient. Stop where it is safe to stop and leave it there. We come to the exact spot in UB6, get eyes on the real damage, and either repair to standard or fit a replacement from on-board stock, with no recovery bill either way.

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Greenford is not flat. The ground climbs towards Sudbury Hill and the residential roads either side of Greenford Road roll enough to matter once a car is up on a jack. Add Western Avenue running straight through UB6 and there are very few spots where a driver should be attempting a wheel change on their own. Park it properly, leave the tools in the boot and let the van come to the car.
A car stopped part way up with the nearside front flat. It was chocked front and back at the diagonal corner before the jack went anywhere near it. On a slope that is not fussiness, it is the difference between a controlled lift and a car that decides to move.
Parked facing downhill on a mild slope with the front wheels left pointing straight ahead. We turned them into the kerb before touching anything else. If a car ever does start to roll, the kerb is what stops it, and it can only do that job if the wheels are aimed at it.
The driver had made a start, got cold and given up, leaving four nuts slack on a car standing on a hill. We put it right, but a car on loose nuts is not something to be near or to roll. Once you have decided to call, put the brace down.
Yes, so long as it is parked properly. Handbrake fully on, in gear or in park, wheels turned into the kerb, and nobody sitting inside if it is close to traffic. It is lifting a wheel on a slope that takes care, and that part is ours.
Please do not. It saves us nothing and it leaves a car standing on loose nuts, which is worse than the flat tyre you started with. If you have already made a start, just say so when we arrive.
Chocks at the wheel diagonally opposite the one coming off, backed up by the handbrake and gear. On the steeper roads around Greenford we will sometimes chock both sides of the same wheel. It takes seconds and removes the only real hazard in the work.
Often, but mention it on the phone. A car with two wheels up on a kerb is sitting at an angle we need to plan for, and now and then we would rather roll it down level by hand first than lift it as it stands.
We come to wherever the car has stopped, including those. If you are at the edge of a fast road say so when you ring, because that changes how urgently the call is treated and how soon the van leaves.
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