What a lovely, warm-hearted man. If I could have my ideal Grandparents, he and Roald Dahl would have been them. (Don't know who the Grandmothers would have been). I could imagine Dahl and Hart sniping at each other in a friendly way.
I always wanted to send a picture in, but don't think I ever did, because they couldn't send the pictures back and couldn't guarantee they'd use it. If one of my pictures happened to be good enough, I was scared of losing it.