Well, I phoned about the other job last night and they were very pleased to hear from me. I need to meet with the MD early next week, but it's all positive and the job is still open to me. It's ?20K more, though it means I'd have to catch a train into the city 3 days a week - BUT this would give me time to read the IN Book Club book, no?
I'm going to go for it. I really don't see myself here long term and I miss working with the technology that I know and love. I'm going to be professional about it though and make sure that I do a proper handover and that it's as easy as possible for someone else to pick up the projects I have on here. We were interviewing for another person here anyway and have 2 great candidates, so I might have to recommend that both come on board.
Thanks to everyone for he advice yesterday - you all make me feel a little less alone here in the UK and I'm really grateful.