Well, we've got our solution but sadly it does mean the friendship is over.
EF emailed us all last night with a right bollocking. Apparently all those years ago when we thought we were happily sharing a house together we were actually all being absolutely horrible to her:
FF was always trying to steal her BFs (We have no recollection of this)
NIF was really two faced and moody - friendly one minute, dropping her like a hot brick the next (NIF is the least two faced person you could meet)
New York Friend thought she was superior to everyone else (No one else ever felt that about her)
Cork Friend was jealous of her (the reason for this 'jealousy' was not specified and cork friend was a pretty sociable girl in a very solid relationship)
London friend was always talking about her behind her back (again we have no recollection of this.
And I was a total snob and only wanted to mix with 'the arty crowd' (have been absolutely assured by everyone that this is nonsense and no one, including EF, ever said anything of the sort about me).
We're all absolutely flabbergasted. I was close to tears when I got the email and so were a couple of the others. We have no idea where all this animosity has come from.
FF emailed her back this morning, with our agreement, and said 'we're sorry you feel that way and obviously, under those circumstances, it will be better for everyone if you are no longer included in our weekend and we cease any communication on it'.
We couldn't get New York Friend's agreement because of time difference but we know from her emails last night that she's as shocked as everyone else.
To be honest, I feel a bit sick and kind of wish I hadn't started this thread now.