Did you CALL the bank?
That letter is written so poorly, it HAS to be fake.
If it's real, leave that bank anyway.
Sorry, I see you DID call. That bank's letter looks like it was written by a 5 year old... surely you have other banks where you live?
I agree.. Letter seems very poorly written for a bank. You should mention that to your local branch.
Do not live in the UK, but do live in Canada.. Personally would contact a financial advisor or lawyer for some questions. They gave no reason for your account being terminated or not "doing business" with you.