Welcome to the forum,if you wish/able to pick up the boat early,I would suggest you phone Richardson's they will tell you if it's poss.The fridges are standard on most boats note large but okay.There is a large Tesco in Stalham and some very good shops.Check out Truely local. If you have not been on the broads I would like others said say on the north.Norwich is a great city,also many great spots in the south.Get used to the broads,then come back next time for two weeks and go south as well.
Have a great holiday We are up a week on Saturday.
Ian