Default schemes -
RAF Europe
Battle of France - Dark Green/Dark Earth uppers, white/black lowers
Battle of Britain - Dark Green/Dark Earth uppers, Sky lowers
Mid 1941 onwards - Dark Green/Ocean Grey uppers, Medium Sea Grey lowers.
1944 - As 1941 but with invasion stripes, gradually being removed in stages after D-Day.
RAF SEAC
Early - Dark Green/Dark Earth uppers, Medium Sea Grey lowers
Late - As RAF 1941 onwards
Both having recognition white bands on the wings, stabs and tail. If natural metal finish bands were either RAF Dark Blue or Black.
RAF Mediterranean
Dark Earth/Mid Stone uppers, Azure Blue lowers.
Of course there were individual aircraft or sometimes squadrons that "did their own thing.
1) 249 sqn in Malta are now by the latest thinking perhaps used Dark Earth/Extra Dark Sea Grey uppers.
2) The blue Malta Spits
3) 16sqns 'Pink' FR IX's
4) Some Czech sqn planes in the Desert Camo 'may' have used Meditteranean blue instead of Azure blue.
etc etc
Its the unusual ones we are trying to find.
Unfortuneately the RAF really frowned on 'individuality', it being limited to sqn CO's and above being allowed to use their initials instead of the sqn code. Hence D*B - Douglas Bader, RS*T - Stamford Tuck etc.
Suppose the greatest chance of unusual schemes would be found far from the reach of RAF Fighter Command in the UK.