Alloa Tower
Clackmannanshire, Scotland
Medieval tower house of the Erskines; seasonal opening
Ballygally Castle
County Antrim, Northern Ireland
1625 plantation castle; hotel since 1950s, famed ghost room
Chillingham Castle
Northumberland, England
Self-catering apartments in the castle
Muncaster Castle
Cumbria, England
B&B in stable-yard buildings, not castle