Links for Brit based nuclear a/c;-

http://translate.googleusercontent.com/translate_c?depth=1&hl=ar&ie=UTF8&nv=1&prev=_t&rurl=translate.google.com&sl=de&tl=en&u=http://www.castor.de/technik/atomkraft/08_1958/72.html&usg=ALkJrhgxjVPJVTQfSEERjKEpWphoNMu_zA

http://www.secretprojects.co.uk/forum/index.php/topic,855.120.html

http://www.secretprojects.co.uk/forum/index.php/topic,546.0.html

http://en.m.wikipedia.org/wiki/Dragon_reactor

Miles aircraft went bankrupt in 1947 which was well before any interest in nuclear a/c.
Avro’s proposed a nuclear ramjet cruise missile similar to the US SLAM/Tory ii (better known as project Pluto)