Crossword

Across
6          - - - Oak, name given to Charles II’s hiding place in the field behind Boscobel House (5)
7          Site of the Triangular Lodge that was designed by Thomas Tresham, father of one of the Gunpowder Plot conspirators (7)
9          Location of a tithe barn on the river Avon first built in the 14th century (8)
10        - - - Bretton, remains of a medieval priory located just outside Barnsley (4)
11        - - - Abbey, ruined abbey with a chequered history, founded in the 12th century (6)
12        County that contains many sites including Tilbury Fort and Hadleigh Castle (5)
14        - - - Carn, Bronze Age burial chamber located on the Scilly Isles (5)
16        - - - Graves, prehistoric flint mine with a grassy cratered landscape in Norfolk (6)
19        - - - Kennet Long Barrow, part of the Avebury World Heritage Site (4)
20        - - - Castle Deer House, Durham animal shelter built as a square mock castle (8)
22        Derbyshire castle built by one of William the Conqueror’s knights in the 11th century (7)
23        St - - - Commandery, former chapel, close to Dover, built of flint walls and later converted into a farmhouse (5)

Down

1          Old - - - Manor, rare example of a manor house that survives from the 13th century, located in Kent (4)
2          German-born composer, famous for his Messiah, who has a blue plaque at his former dwelling in Brook Street, Mayfair (6)
3          - - - House, building constructed as a conduit to supply water to Bolsover Castle in the 17th century (5)
4          River, for the defence of which Tilbury Fort was built to prevent an attack on London by the Dutch navy (6)
5          - - - Pillar, monument constructed in 1656 by Lady Anne Clifford at the gateway of Brougham Castle for her mother (8)
8 & 13D          - - - Priory, medieval monastery in North Yorkshire (5,5)
11        Town with the remains of a 15th-century guildhall located on the Norfolk coast (8)
13        See 8D
15        - - - Castle, Norman motte and bailey fortification that affords views across the River Dart in Devon (6)
17        - - - Chantry, former leper hospital in Kent that was used as a gas decontamination chamber in the Second World War (6)
18        - - - Lloyd George, former prime minister who commissioned Edwin Lutyens’s war memorial, the Cenotaph, in 1919 (5)
21        The - - - Stones, prehistoric stone circle located just off the A35 in Dorset (4)