This sort of project is bound to require help from others. I am indebted to the following for their help and support:

• The various authors from whom I've collected this data and who have inspired me by their work and their great regard for the subject. Please see the bibliography.
• Much of the bibliography for individual sites is derived from the three excellent bibliographies produced by John Kenyon for the Council for British Archaeology (Volumns 2 and 3 are available online) and the annual bibliography produced by him for the Castle Studies Group.
• The National Monument Record Team at Swindon for much information on various sites, for running the PastScape online National Monuments Database from which much of the information on this site is derived and for there kindness in allowing me to use that information.
• The various librarians, booksellers and museum curators who have helped with requests for books and information.
• Jeff Thomas for his praise, support, information and the inspiration provided by his web site.
• Michael Cook for his praise and support.
• Andrew Muller for his photo of Holwell Motte and Bailey.
• Paul Reeves for sharing his information on obscure castle sites.
• Peter Iles for his information on the castles of Lancashire.
• Richard Skinner for his information on Holme Spinney.
• Michael Radcliffe for information on Parwich 'castle'.
• Jamie Ayers for information on Ceaser's Tower, Coventry.
• Rebecca Roseff for helping to resolve some questions about possible castles in Herefordshire.
• Neil Guy for general encouragement and suggestions on layout and content.
• Paul Remfry for general support for the idea of the site and much specific information on many castles in the Marches.
• Paul Brown for information on Oswestry Castle and Town Walls.
• David Roffe for information on Newhouse Castle and Grantham, Lincolnshire and for help with design of this site.
• Rob Dixon for information on Boarstall Tower, Buckinghamshire.
• Peter Ryder for sharing thoughts and comments on tower houses and bastles.
• Jon Seddon for locating 'Barkshale Wood'.
• Will Davies for pointing out errors and adding information on castles sites in Monmouthshire.
• Christopher Taylor for information on Hanwell Castle.
• Peter Thompson for information on Ty Gwyn, Barmouth.
• Phil Wood for information and a citation regarding Newbury and Hamstead Marshall castles.
• James Davidson for information and a citation regarding Hen Domen, Llansantffraid Deuddwr.
• Charles Coulson for help with the list of licences to crenellate.
• James Wright for information on East Bridgford and Strelley Hall in Nottinghamshire.
• David Maynard for pointing out an error and for information on several sites in South Wales.
• Robert Waterhouse for information on some south Devon sites, particularly Keynedon Barton.
• Me Mum and Dad for taking me to so many castles when I was young.
• Jan for keeping me company at home and on trips to castles.