RAC are supposed to be there in 45 mins.
If not you can ask Motability for a taxi home that’s what would happen. Fact is spare wheels are a dying option even if you buy one there’s few vehicles with room for one. Partly driven by the demand to reduce weight for emissions or range.
Tyres exploding are pretty rare on well maintained cars usually caused by either under inflation maybe slow puncture or hitting something. Either way it’s a margin case you could also say what if a wheel falls off and I haven’t got a spare really you probably ought to not be driving the car you don’t know what damage has been done for example a damaged brake flexi