For those that don't keep a regular eye on the American Radio History website, they have just uploaded a selection of books that may interest some of the members here.
A lot are UK published, from the 1940's through to the 60's in general, from some well known authors - Edwin Bradley, Len Buckwalter, F.J. Camm, A.T. Collins, Gilbert Davy, F. G. Rayer and Clive Sinclair amongst others.
http://www.americanradiohistory.com/...f_Hobbyist.htm
Terry