A sci fi serial by John Wyndham... I can't believe I haven't been recording it here.
Well, you've missed 4 of 5 installments.
The secret of long life has been uncovered but, due to Francis' reticence, Diana must face the intense media pressure alone. Episode 5 of 5.
Basically, scientists discover how to extend life using an extract from a certain lichen... but there's not enough to go around...