PPRT, how quaint. In the 60s you already had Nudets.
In UK we had the Royal Observer Corps, volunteers in small buried bunkers spread discretely around the UK and manned by 3 people. Burst direction was observed using the burn marks on a paper screen I believe. Many bunkers were only a few miles from major target s but they should have been OK.
Less fortunate would have been their liaison officers at the target.