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He claimed driving their parents cars had been an “emotional journey” for the three hosts and praised the producers for the “clever idea”.
He said: “It’s a heartfelt film, and it was probably further than I ever wanted to go sharing my personal life on TV.
“My father died a long time ago and even though you move on with your life I still find it quite difficult to talk about him.
“I’ve got lots of cars and I’m very lucky that I can get hold of most cars I want, but out of respect for my father I’d never sat in the driving seat of that BMW model before and it took some persuading to get me to do the film.