I used to live in England and visited all the wonderful places you are going. Quilt fabric will be higher than US. Great wools over there...prices on wool may be less than US, but heavy to travel with and then you have to ship...
Use the "tube" "underground"..subway for travel when in London. The traditional "black taxiis" are alot more expensive than the others. Ask the locals for fish and chip places..
You will have a blast! We are jealous....have a wonderful, safe time.
Diana in TX