We had Kwik fit out three times (rural and low profile tyres don’t mix well apparently) – every single time they came out within 24 hours. Not on the day, admittedly, but always the next day before 1pm, and were done within an hour. Once repaired, twice replaced (through the sidewall).
I genuinely can’t complain, the guys that came out were nice too and were efficient/quick, even thought about re-setting the TPS (not a big step for us to do anyway, but nice that they did it).