I have accounts with HSBC, NatWest, Santander, Nationwide, First Direct, Halifax and WISE - and cards with TESCO, MBNA, Virgin and Monzo.
I have banked with HSBC for 52 years (I worked for them for 31 years) but I have recently made NatWest my main bank. Personally, I prefer their online banking system and their app. Santander is also good and they are no stricter on MLR checks than any of the others; you can’t avoid them - and as mentioned above keep a U.K. address and phone number.
I would recommend retaining at least one U.K. bank and link to WISE. Expat friends have previously cut ties with the U.K. and now do not qualify to open one.