You will be asked some serious questions on re entry, such as why you live in Thailand long time without longterm visa. Get a proper long term visa before you come back.
You will need a UK mobiole number for the bank to send verifying texts to you when moving money via a website etc as all banks are using enhanced securtiy. You usually get a 6 digit code ro put in to make sure it is in fact you moving/spending the money. You couls always use a PIN sentry card reader.