David Jason
One of Britain's best known comedy actors (primarily). Started out in his twenties doing bit parts in Ronnie Barker's Porridge and The Two Ronnies (ironically, often made up to look like an old man) before securing the regular role of Granville on Open All Hours, also alongside Barker. He's perhaps best known for his role as Del Boy Trotter in Only Fools and Horses, although in recent years he's also become known for the more unusually straight-drama lead role of Inspector Jack Frost in A Touch of Frost.
A national treasure and immediately recognisable. Dead Ringers once did a sketch claiming that "on ITV, every night is David Jason Night" and that The BBC planned to retaliate by running nothing but repeats of Only Fools and Horses. Similarly, he was given top billing in the first two Sky One adaptations of Discworld novels Hogfather and The Colour of Magic, despite the fact that his role in the first (at least) was quite minor (It also didn't help that the leading character was a 7 foot tall skeleton with a scythe.
He also did the voices for many Cosgrove Hall cartoon characters, including Danger Mouse and Count Duckula.