Which radio programme used the catch phrase, "After you, Claude. No, after you, Cecil?"

The popularity of the catchphrases was demonstrated by a letter which Tommy Handley received from a little girl who had been taken to see the Tempest in Manchester. At one point an unfortunate actor playing Ariel had to say the fatal words 'I go, I go', which was followed by the whole audience shouting 'I come back' -the catchphrase of Ali Oop. There are other catchphrases mentioned in britishcomedy.org.uk/comedy/itma.htm

The show ITMA was renamed 'It's That Sand Again' and began a six week summer season on 20th June 1941. It was set in a seedy seaside resort called Foaming at the Mouth, with Tommy Handley as the town's Mayor. Vera Lennox and Maurice Denham had departed, and in their place came Sydney Keith, Horace Percival, Dorothy Summers and Fred Yule. Several soon-to-be-famous characters were launched: Lefty and Sam, the gangsters (Train and Keith); Deepend Dan the Diver (Percival), (based on a man that Tommy Handley once saw seeing diving off the pier at New Brighton and collecting money from ferry passengers), Claude and Cecil, the over polite handymen (Train and Percival) and Ali Oop (Percival), a Middle Eastern vendor of saucy postcards and other dubious merchandise.

http://www.britishcomedy.org.uk/comedy/itma.html

ITMA ran on radio between 1939 and 1949 and at its height it had over 20 million listeners. It became as much a part of wartime Britain as rationing and Vera Lynn. It only ended with the death of Tommy Handley. After a shaky start as a Band Waggon imitation it developed its own style and became the ultimate catchphrase comedy. It's this development (charted in Andy Foster's and Steve Furst's book Radio Comedy 1938-1968) that makes ITMA so difficult for modern audiences to understand. It was also extremely topical which makes many of the jokes meaningless today.

The film version, stripped of most of its topical references, is now much more accessible than the original broadcasts that remain. The plot is just an excuse to shoe in as many of the radio characters as possible. Within the first four minutes we've had a phone call from Funf ('This is Funf speaking'), a visit from Ali-Oop ('I go - I come back') and a quick clean around from Mrs Mopp ('Can I do you now Sir?'). Other catchphrases include 'It's me noives', 'After you Claude - No, after you Cecil' and, most bafflingly of all, 'Don't forget the Diver'. Many of these phrases entered the language.
http://www.britishpictures.com/arch_i1.html

It's that man again (ITMA)

http://news.bbc.co.uk/1/hi/entertainment/204767.stm