Thanks everyone for good luck wishes, I just signed the contract a few minutes ago and start Monday. I was negotiating like crazy to delay the starting date but they were having none of it.
I'll be driving around the m25, a commute that takes 30 minutes on a good day and can take hours if the M25 is jammed up. Maybe a bit less miserable than taking the train to the city, but I'll miss my daily walk.
Good Luck EvyF, don't feel bad because I found a contract in a month while you've been looking for longer. It's a different market with different timescales. If you do want me to send you a copy of my CV, PM me your email. I can't attach it to a private message.