As I understand it, you should really have the same tyres on the same axle, in other words the two fronts should be the same and the two rears the same, but front and rears can be different.
I was under that assumption, but reading into things, that’s not the case.
They need to be similar, but not the same. And by that, i don’t just mean size/rating, but also compound and wear (as in, don’t run an old tyre with a new one). For example, on the front, we have now Sport Contact 5 on the left, and a Potenza.. something something on the right. This is fine, other than screwing a bit with my OCD.
The car doesn’t drive different, nor worse (and i do explore the limits of lateral grip every now and then).
You can’t chose what Kwik Fit is going to give you, but they’d be liable if you’d crash due to mismatched tyres, so they will replace the blown tyre with something that is similar (especially if you get their van out, like we did a few times now, you can’t expect them to have every wheel on the planet in the van).
Of course, there’s always the chance that they’ll just repair the puncture (if isn’t in the sidewall or the “transition” from running surface to sidewall), in which case all this is moot anyway.
Prior: SEAT Ateca Xcellence Lux 1.5 TSI DSG MY19, VW Golf GTE PHEV DSG MY23
Current: Hyundai Ioniq 6 Ultimate
Next: we'll see what's available in 2028.