I use Wise also but prefer Revolut, I don’t even bother having a Wise card these days, I only really use it for sending small amounts around.
Best thing you could do imo would be open up a couple of additional accounts with whoever you choose and then move your money out of Santander asap. I wouldn’t bother closing the Santander, leave it empty and let them close it if they feel the need.
I use Nationwide, Smile, Revolut, YB(Virgin), Monza all without hassle.
Never used Santander but over the years any of my pals who have had problems with banking it’s always been Santander giving them hassle.
Revolut in particular is useful because you can setup a Thai baht account inside the app and use your card normally in Thailand. I swap GBP for THB in the app then use it for buying fuel & groceries etc. here in Thailand.
I used sevenseasworldwide to ship a movecube from Uk to Thailand last year. Received ok in about 7 weeks, didn’t pay any duty. About 500kg of items. Pretty good service, would recommend.
I just renewed my mums extension and immigration scheduled another appointment in 3 months to check her bank book to make sure the money hasn’t moved. No problem for us as we did it ourselves and followed all the rules but I’m assuming there’s going to be a lot of tears flowing over the coming months if they’re cleaning up those who don’t have the money.