Too late this time, but I can highly recommend
https://iphonerepairbase.co.uk for above and beyond and very fast service. True story - my wife's iPhone 6s needed a new battery last year, the old one was bulging. Took it to our local iStore (Albion), who did the job (£50 odd quid and about a week to do it). Three months later the phone stopped working - took it back and they said new logic board - £309 please (or a new SE for £399). That didn't smell quite right to me, so I sent it to iphonerepairbase.co.uk for diagnosis - the next day the guy emailed me a written and illustrated report to show that when the battery was changed, the metal shield was refitted the wrong way round, creating a bad connection between the two pins, which lasted for a while and then shifted slightly enough to cause a fail. He sent the phone back, working, and with no charge, save for £8 for special delivery. Nice to know there are some honest people still around.