Longest Career - UK Entertainer

I was watching the telly over Christmas and heard the joke: Question - how does Brucie keep looking so young? Answer - He doesn't. I know Brucie has been around for a few years, and I thought I'd see if I could find out who has the longest career as an entertainer in the UK.

General caveats - I'm excluding musicians and writers to begin with, and focusing on TV and Radio. I'm also trying to exclude "one offs" at the tail end of careers.

Who	Start	Programme	Finish	Programme	Years
Bruce Forsyth	1939	Come and be Televised	2011	Strictly Come Dancing	72
David Attenborough	1954	Zoo Quest	2011	Frozen Planet	57
Rolf Harris	1953	Jigsaw	2010	Jamie's Dream School	57
Patrick Moore	1957	The Sky at Night	2012	The Sky at Night	55
Nicholas Parsons	1957	The Arthur Haynes Show	2012	Just a Minute	55
Ronnie Corbett	1957	Sheep's Clothing	2011	Ronnie Corbetts Comedy Britain	54
William Roache	1960	Coronation Street	2012	Coronation Street	52
David Dimbleby	1962	Top of the form	2012	Question Time	50

My conclusion would seem to be that Bruce Forsyth does have the longest entertainment career, unless anyone else knows better - happy to take suggestions, or indeed for anyone else with a 50+ year career. Data sources - Wikipedia, BBC, IMDB, Radio Times, BFI Screenonline web sites.

Note - Bruce Forsyth was not on TV between 1939 and 1958, when he hosted Sunday Night at the London Palladium. giving him 53 years on TV, which might make me prefer to put Rolf Harris or David Attenborough at the top of the table.

Edit - 21st Jan 12 - David Frost started 1962 TWTWTW.