I think that the GUEST who got the impression that people in the UK didn't want to talk about VietNam may have run up against polite people who thought it unfair to impose their views on this visitor who couldn't be blamed for what his government was doing.

In fact there was an enormous amount of activity around the VietNam war issue in this country. Generally speaking people involved in this combined deep contempt towards the administration that was waging the war with enormous admiration for, and a sense of solidarity with, those Americans who were involved in the struggle against it - most especially those ex=soldiers who were opposed to the war.