It is, thank you.
That clergyman seemed familiar for a reason and I'm now almost certain that he is John Collins.
This would have been exactly the sort of thing he would have been involved in. He was a founder of both War on Want and the Campaign for Nuclear Disarmament, prominent in the anti-apartheid movement and a member of the Anglican Pacifist Fellowship. Despite all this, and his developing views on bombing and war in general, which were diametrically opposed to Harris', the two men remained on civil, friendly terms.
It was Collin's wartime experience with the RAF, and maybe his association with Harris, which led to his fairly radical views in later life.
Cheers
Steve