I remember all the ones you mention, Grannyclaret. Wasn't Jennifer Gaye the daughter of a famous conductor? (Orchestra, not bus
). I think it may have been Sir Hugo Rignold.
I know MacDonald Hobley died some years ago and so did Mary Malcolm. Funnily enough there was something about Sylvia Peters (the other lady presenter) in today's Express, remember her?
One of my favourites as a child was Humphrey Lestoq who fronted a children's programme called "Whirlygig", with a dreadful string puppet called Mr Turnip. I though HL was wonderful and so-o-o-o handsome!
I know he was an actor and appeared a lot on the West End stage (that's London, not where I was born
) but I never heard of him after about 1955. He had been a RAF fighter pilot in the war so if he's still alive he'd be at least in his 80s.