Thanks everyone for the good wishes.
I'm sitting here really worried about it all.
The saga slightly continues...
We went last night but the people we were delivering things to (including keys to the building etc) forgot and were out, so we came back here with everything.
We can't really resign until we have dropped these things off (bit hard to explain as lots of reasons to do with the service we do, but one of them is that the organisation rents space from a place who only gave us one set of keys that you can't copy so we are the only people who have keys to let the organisation in etc)
So the new plan was to go today, open up so everyone could get in, leave them the keys and get out of there which I think is behaving responsibly.
And then email the letter out to the person responsible (and post it recorded tomorrow to their office)
But DH then decided that we could not possibly just turn up today, open up and leave as this person's children would be present so he didn't want to upset them.
So he decided we should go, open up, stay throughout the meeting and then at the end hand in the keys once the children were in the car...
I refused to go. I don't want to upset anyone's children but at the same time I can't sit there through four hours pretending I'm on board and then announce I'm leaving at the end.
And now I'm really worried I did the wrong thing as what if they accuse DH of something??
I made him promise he would not be the last person there, and not to say he was leaving for good, just that he wouldn't be around next week so could someone else take the keys to open up etc, but I'm worried that anything could be said afterwards. This person is not going to tell anyone who asks why we have left the truth, so presumably he will make up a lie about us, probably saying he had to kick us out for doing x, y or z, and now I think we've just made it a lot easier for him.
DH won't be back till 9:30-or 10:00ish, so I have to wait for him to come home... really wish we just left them locked out for the evening or sent the keys in a taxi or something but I didn't think of that in time.