Nationwide lost a photocopy of my passport, my bank account details and a signed form!

Supose they hadn't lost these things but returned them to you, how are you to know someone hasn't phptocopied the photocopiies? I think you are over reacting.

I am not overreacting at present because I haven't done anything but it makes you wonder where they went doesn't it? And are they enough for someone else to start accounts in my name?

They probably just got lost. Would photocopies of somebody else's details be sufficient for you to open up a bank account in their name? Possibly if you worked for Nationwide...

Their getting lost is irrelevant because anyone could have stolen the same details without losing them and so drawing attention to the fact that they'd been stolen! In which case (arguably) you are less at risk than you would have been if they *hadn't* gone missing!

Lost could mean shredded by accident.

Woolwich lost a similar set of documents from me ...twice in two weeks :-)

And I agree with some other posters you are massively overreacting. Suppose they had the originals, copied them (without you knowing) and then gave them back to you, you'd be a happy bunny....?

Try this URL and read the section on fraud (the supposed 1.3Bn a year the govt bandies about)

I agree with Troy 100%. I don't know what you're worrying about. Losing documents is what banks do. It's the first course on their training. The second course is passing customers to another department. Third is not being helpful but getting off the phone quickly.