After a lot of messing, I accessed the new site briefly just after the move, next morning I refreshed the screen and it went back to silly, maintenance mode.
Last night I spent best part of an hour clearing catches, clearing/resetting the DNS etc. All to no avail, this morning I am straight in??? For how long I don't know, I could get on from my iPhone when away from home but not at home. I am beginning to wonder if part of the issue is my 'smart' router, serving up what IT decides, irrespective of what I actually WANT.
Anyway, many thanks to Birna and the team, I'm sure it's a good move in the long term, it's just been a rather bumpy switch.