Updated with latest find, Bradenham Manor, Buckinghamshire and West Norfolk and Lynn Hospital, found by Jool.
1 Kirby Muxloe Castle - identified by Still Looking;
2 Ravensworth Castle - identified by Trish
3 Inverewe Lodge, Poolwe, Rosshire - identified by Yorkslass
4 Burnham Beeches Manor, Buckinghamshire - identified by Trish; Side building (separate photo) identified by Mosiefish; Royal connection identified by Jools
5 Thurso Castle, Caithness, Scottish Highlands - identified by Still Looking
6 Aldermaston Court, Newbury, Berks - identified by Ruskie and Wiggy
7 Hall Place, Leigh Kent - identified by Yorkslass
8 Cromer Lighthouse, Cromer, Norfolk - identified by Roopat
9 Tilgate Mansion, Crawley, South Yorkshire - identified by Yorkslass
10 Balhomie, Cargill Perthshire - identified by Yorkslass
11 The Rookery, Bromley Common, Bromley - identified by Still Looking
12 Not yet identified (house with tower)
13 Skeabost House, Isle of Skye - identified by Jools
14 Jersey Lighthouse - identified by Malky
15 Glenlyon Estate, Fortingall, Perthshire - identified by Still Looking
16 Fountains Abbey, North Yorkshire - identified by JenB; KGarrad and SueTeakle.
17 Herstmanceux Castle, Sussex - identified by Jayhen6
18 Pevensey Castle, East Sussex - accidentally discovered by me
while researching WAI 17
19 Not yet identified (Mock Tudor House)
20 Not yet identified (Thatched farm)
21 St Andrew's church, Alexander Park, Muswell Hill - identified by Mosiefish
22 Bradenham Manor c1670s - identified by Jool
23 West Norfolk and Lynn Hospital - identified by Jool
Caz