The only existing book on Terry Nation is Jonathan Bignell and Andrew O’Day’s Terry Nation (Manchester University Press, 2004), an academic study which focuses on his science fiction work. For Nation’s own accounts of his career, see in particular the interviews with Jackie Ophir, Diane Gies and Nicola Best in the magazine of the Blake’s 7 Appreciation Society, Horizon, issue 22 (June 1989), and with Joe Nazarro in TV Zone issues 31, 33, 34 and 35 (June–October 1992).
Graham McCann’s Spike & Co: Inside the House of Fun with Milligan, Sykes, Galton & Simpson (Hodder & Stoughton, 2006) is the definitive account of Associated London Scripts. Long out of print, Denis Gifford’s The Golden Age of Radio (B.T. Batsford, 1985) remains an essential reference work, even in the age of the internet.
Of the many books on Doctor Who, David J. Howe, Mark Stammers and Stephen James Walker’s series Doctor Who: The Sixties, Doctor Who: The Seventies and Doctor Who: The Eighties (Doctor Who Books, 1992–7) are recommended, as is Time and Relative Dissertations in Space (Manchester University Press, 2007), edited by David Butler.
James Chapman’s Saints and Avengers: British Adventure Series of the 1960s (I.B. Tauris, 2002) is an entertaining take on some of the key ITC shows.
For Survivors and Blake’s 7, see respectively Rich Cross and Andy Priestner’s The End of the World: The Unofficial and Unauthorised Guide to Survivors (Telos Publishing, 2005), and Alan Stevens and Fiona Moore’s Liberation: The Unofficial and Unauthorised Guide to Blake’s 7 (Telos Publishing, 2003). Both are excellent.
And finally, the best books on the fiction of Nation’s youth are still Richard Usborne’s Clubland Heroes (Constable, 1953) and William Vivian Butler’s The Durable Desperadoes (Macmillan, 1973). They’re even more fun than the novels they chronicle.