Thanks Taz2 and Tc
I actually put the combined patch on a little earlier. Never mind, I'll know in future if they come off a day early just switch.
I was getting really stressed for a few hours leading up to it, not sure if it's a bit of heat exhaustion (today was first real hot day in the UK and I was running around left right and centre all day), but my skin was flushed red as well (haven't been burnt). I've put the patch on and that calmed down but then my digestive system is all a bit upset. But it may be heat exhaustion.
Yes Taz2 I was using them correctly but with the lockdown and the shortage of supply, I got a bit out of sync some weeks ago by a couple of days. Then I think I was given a really old box of them and they were all useless and kept falling off (fine now with another box and was fine with the first couple), hence me posting a lot about it all lately.