Hopefully not too off topic but we really enjoyed our visit to Scotland many years ago. Largely did the B&B thing, which was great. We still remember the guide at the tour of Edinburgh castle. Very funny ("During one battle, it was 10 Englishmen for every 1 Scot. We considered that a fair fight.")
I don't know what your travel arrangements are, but there is/was an overnight train from Glasgow to London and from Edinburgh to London. Very useful for gaining a bit of extra daylight time during your visit.