wonderful - thank you.

The Genome Index of The Radio Times
gives some details of the broadcasts.

http://genome.ch.bbc.co.uk/schedules/radio1/england/1968-02-17

http://genome.ch.bbc.co.uk/schedules/radio1/england/1968-02-17

is a good starting point.

Note that the programmes (at least the ones I've played
from 1968) were broadcast on Radio 1 and Radio 2 simultaneously,
but the only entries in the Radio Times Genome Index are on pages
for Radio 1