Number 3 was Brown. Was never sure about Callaghan- I believe his working class loyalty credentials were sound and he would not have been involved. I remember well the upset the TSR2 business caused. It would have had incredible performance and as a medium/long range bomber would have had little trouble penetrating the opposition. Instead we got involved in the F111 fracas despite warnings not to go there. I am surprised Polaris survived the various governments, but I have to say that I always found Wilson dodgy and his whole retirement saga very suspicious. It's coming out that several Labour MPs were very likely working for the opposition, I have little doubt that several Labour cabinet members were doing so. There was a distinctly weird and dodgy respect for the ideals of Soviet communism in the 50s and 60s- it wasn't just the Cambridge University 'mafia' who were up to that nonsense. We needed some damn good executions for treason to put the wind up the rest. Why we aren't doing that now to terrorists is beyond me- they want to martyr themselves- we'd just be helping them on their desired path. Instead they are using our hospitality to preach their hate against us. I find it fantastic that Blunt and Philby and others found their loyalty to Socialism outweighed their loyalty to the flag. I have no illusions that many MPs were not similarly inclined, even cabinet ministers. Some may have been coerced, but it must have been so easy to honeytrap them.
BTW, Gaitskill's departure may have been natural, but there was talk at one time that he could have been 'removed' to make way for someone. There is just an awful lot of smoke coming from the government- it seems too much smoke without any fire not to be ignored.