Toke Townley, who used to play Mr Sugden on Emmerdale Farm
Minor point - he wasn't a Sugden, he played old Sam Pearson (Annie Sugden's father).
As to the topic:
Griff Rhys Jones at Liverpool Street travel centre, getting a ticket back to Suffolk;
Geoffrey Palmer, many times on the Chiltern line;
John Craven, same;
Bill Drummond, from the KLF, used to catch my train most days in the mid/late 90s;
David Cameron, in the bay in front of me on a train to Great Missenden three weeks ago (with baby Florence and a few minders);
Ken Livingstone at Baker Street;
Michael Foot at Newport once;
Kirsty Wark on the Caley sleeper;
Alastair MacGowan at Reading;
Armando Iannucci on the Met line a couple of weeks ago