Have a wonderful trip. Should you find yourself in Oxford, Pitlochry Woolens has very nice sweaters etc. very cheap. As everyone will tell you, J.R.R. Tolkien, C.S. Lewis, and Dorothy L. Sayers did their drinking at the Lamb and Flag. The Trout serves excellent food, and they have a lovely view.
Should you find yourself in London, have a nice drool at the costume collection in the V and A.