Ok, after being left at Gatwick for 3 days and starting fine, I left her sat nite, sun day and evening and went to start monday morning at nothing, so I jumped her to get to and from work and last nite left the battery disconnected overnite. I re-connected it this morning and she started fine so the battery appears not to be at fault. The only thing I did different at Gatwick was take the stereo face out, so I did this at work today and this evening, she started fine...!
I can't think though that leaving at stereo face plugged in would drain the battery...?