The original plan was do it ourselves with a BritRail pass. I've tried to game plan that with a family of 5 though and it just seems to get real complicated -- and real expensive -- real fast.
So we're seriously considering a packaged tour that would take us to many of our "must see" spots -- Edinburgh, Wales, Bath, etc. It would be June 4 - June 12. The big advantage is a big chunk of our transportation and lodging would be taken care of. It would still leave us 5 days to do on our own,
The packaged tour will cost $6000, or roughly $600/day which will include breakfast and 3 or 4 dinners.