Hi Jo
Naffing annoying. Unless the place burned to the ground at the weekend, they have no excuse whatsoever for losing the paperwork.

Especially not when your taxes are paying these cretins.
I TRUST they have said, Come in with the docs again
whenever it would be convenient for you, Mrs Hatts." Not this make another appointment rubbish?
I'd take them to the wire now that you've got the moral uper hand. They can post the letter asking you to deposit the bond by all means. BUT THEY CAN ALSO FAX IT TO YOU PRIOR TO POSTING. The Bank will accept the faxed copy, so you may be able to get the Bond lodged pretty quickly. Ring them every day and drum it into their heads that that letter must be signed and then faxed as well as posted.
Cheers
Gill