Thanks for the response. I can't think of anything other than my account being hacked at some point between when I last checked it successfully and when I found my access to be blocked (could have been a couple of months)? I don't have any reason to think this has happened though as I've always been very careful with my passwords etc. and never had anything hacked before. I've only ever moved in reasonably constant amounts from "salary --> account salary is paid into (this has changed a couple of times over the years) --> this savings account". Like I said, they won't give me any information at all, including how much is currently in the account or whether there have been any suspicious transactions. I guess it's even possible some of my money has been stolen but I have no way of knowing... They have neither given nor requested any information...
Let's say my account was hacked (or something else I haven't thought of), why is it taking them so long to resolve this? Wouldn't they want information from me? I've told them about the house situation but from my end they don't appear to be doing anything at all. What could be taking them so long? Don't they have some kind of responsibility to deal with this quickly when someone's savings are involved? Of course if something's gone wrong I understand that they would need to investigate, but it's as if there's no accountability for whether they're actually doing anything or not? If this had happened last year, for example, then waiting for a few months wouldn't have been a problem... FOS said they wouldn't be able to look into this for one to two months!