The standard "Temperate Sea Scheme" would be what you're looking for, which was:
Uppersurfaces of Dark Green and Ocean Grey
Lower surfaces of Medium Sea Grey
Fighter Command had yellow leading edge stripes on the wings.
Xtracolour make good matches for the above colours.
Other matches can be found at www.ipmsstockholm.org in the help section (Urban Fredrikson's charts)
Edit: Direct Link to UK Colour Schemes