Regional books are great (but I would say that):

Aside from Derbyshire and Cheshire:

Wales:
From Logaston Press (although some are now out of print) the Monuments in Landscapes series -
Prehistoric Sites of Breconshire
Neolithic Sites of Cardiganshire, Carmarthenshire & Pembrokeshire
Vol IV - Prehistoric Sites of Monmouthshire
There is also one of the Gower

The Architecture of Death - Neolithic Chambered Tombs in Wales by George Nash

NP Figgis - "Prehistoric Preseli-a field guide"

All worthy of shelf space. Too many more to list.

G