GGG Ping.
IMHO the Norwich Castle is a must see for anyone going to England. The dungeon is enough to give you the willies even today. There are also great walks around town and the Cathedral is not far. Fly into London but get out to the cities and villages as soon as possible. I still have friends who live outside the town and deal in small antiques and what we would call nick nacks. They used to get some of their stuff from the old “tips” (dumps) from Norwich. Great stuff that was just thrown away back then.