'Gavin & Stacey': Ruth Jones, James Corden improvise a musical - video
Published Dec 12 2011, 15:36 GMT | By Catriona Wightman
© Rex Features / / Ken McKay
and James Corden have improvised a song for a potential Gavin & Stacey
The duo, who co-wrote and starred in the hit BBC comedy, performed the track together on Jones's upcoming show Ruth Jones's Christmas Cracker
Jones reprised her role as Nessa - complete with her catchphrase "What's occurring?" - while Corden returned to his character Smithy.
The improvised song comes shortly after Jones admitted that she would like to write a Gavin & Stacey musical
. Jones also revealed that another episode will "definitely" be produced in the future.
Other guests who will appear on Ruth Jones's Christmas Cracker
include Micky Flanagan, Lulu and The Manic Street Preachers.
The show will air on December 21 at 10pm on BBC Two.> Joanna Page: 'I want Gavin & Stacey special'