Complete text of 1973 book by the late C.H. Rolph examines the origins of Scientology, the skirmishes of Scientologists with the law in the U.K., and their aborted attempt to infiltrate the National Association for Mental Health.
http://www.religio.de/books/chr/chr.htm
1971 book by Cyril Vosper, a former senior official at Scientology's Saint Hill headquarters in England.
http://thingy.apana.org.au/~fun/scn/books/vosper/