I understand from an interview, Frances De La Tour did not get on with Leonard Rossiter and for many years after the show had ended, she refused to talk about it. I hope that she changes her mind and does talk a bit about the show, would be fascinating.
Its amazing how time makes these shows such classics and what a shame that some of the actors did not live long enough to see this. Shows like Dads Army, Steptoe & Son also spring to mind.