Looks a good read, deals with megaliths, and an excellent biography of Hutton at the end, his favourite Neolithic long barrow being the one at Gatcombe Park, Glos.....

Pagan Britain

By Ronald Hutton
Yale University Press, 400pp, £25.00 and £36.00
ISBN 9780300197716 and 98584 (e-book)
Published 21 November 2013

http://www.timeshighereducation.co.uk/books/pagan-britain-by-ronald-hutton/2010124.article

Also a review;
http://www.theguardian.com/books/2014/jan/23/pagan-britain-ronald-hutton-review