Not personally but my dad worked with him quite a lot, he was a cameraman on the first few series of Bargain Hunt. Apparently he was lovely, always had time to chat to the crew (something relatively rare among ‘stars’) and had a cool catchphrase - when he was done for the day he’d catch the attention of his driver and say “Martin - start the car”
I very much trust my dad’s judgement of people and so if he says Dickinson is a good egg, so be it!
I’m trying to think of other people he worked with who were nice. Bob Monkhouse was apparently brilliant too.