I was finished with the account and from what I remember I was transferring the small remaining amount out of the account but it failed to go through so I tried again and it must have done it twice. Their system however shouldn't have allowed me to do what I did - the amount could have been much larger.
Clearly this is an automated letter that was sent out. In the meantime I managed to find the 4c and transfer it into the a/c. Mainly because I'd have probably ended up with a bad credit rating if I hadn't.
I tend to leave unused accounts open - if the interest rates improve I can re-use and opening an account is allot of hassle.