Hi Fran,
Chas and Dave are a couple of Cockney (Londoners) musicians who have been around the British music scene, for a long time. Chas plays piano, Dave plays electric Bass and Mickey Burt plays drums. They mostly play typical London Pub songs and as far as I am aware, still tour around the pubs, although I believe they run a pub of their own.
Chas Hodges is actually a very accomplished musician who plays piano, Fiddle, Bass and Guitar. He used to play with a country rock band called Heads, Hands and Feet, in the Sixties. That band also included a guitarist called Albert Lee, who is probably one of the best country rock guitarists and is in great demand as a session musician.
They have got a web site, so have a look here: http://www.chasndave.freeserve.co.uk/
I've got a couple of their recordings so I'll have a look tomorrow and see if I can find the song you mentioned.
Cheers

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Willum