never been there but I am not staying in the uk a minute longer than I have to. If could afford the MM2H I would stay in penang. Probably Songkhla so I can get back to Penang easily with a muliple entry for Thailand.. I have 'family' in Penang but the MM2H is a bit out of my budget.
I hope to make the change as my pension arrives and salary stops, otherwise as you say, a headache to change but the bank should take care of your direct debits and such
Might be worth checking if you ever need a One Time Passcode and co op won't do international calls.
For me Santander require a Uk phone number, which I won't have.....and I figure an international bank will be much more efficient than a building society based in europe...