I adore 'the Crib', as he is affectionately known in our house, whether it's as above Railway Children, Wombles (he voiced/narrated), Fawlty Towers, Doctor Who (1960s film and modern series) and christ knows how many other appearances elsewhere, he's just a legend, and always appears sweet as anything.
He once appeared on Never Mind the Buzzcocks...youre a little fearful that a gentle soul like that would get ripped to shreds by all these raucous young 'uns, as has happened on the show... it was mentioned that someone had paid a record sum for a pair of Kylie Minogue's knickers, there was a pause... and cuddly, sweet innocent Cribbins pipes up saying "Do you wanna see 'em?" and absolutely brought the house down with tears of laughter.
Legend!