Using the beauty of cut and paste, this is from the Maple Leaf forum and missing lynx;
http://www.network54.com/Forum/47210/thread/1050505298/RAF+vehicle+colours+and+published+references
These are notes from (1983) copy of wheels of the RAF:
Up to 30s, Army Khaki
30-1940 (Battle of Britain) - RAF Blue/grey
1940 (Battle of Britain) - disruptive pattern applied to MT based in SE
England similar to that of aircraft, but using industrial camouflage paint
intended for buildings (he doesn't mention shades)
August 1941 - standard scheme for RAF vehicles introduced of overall khaki
green no3 with diruptive scheme of Nobel's tarmac green no 4 (Same scheme
applied to Army vehicles)
Also, anti- gas patches were applied to the offside mudguard, yellow
square
until 1941, brown blotch after this. After '43 paint in general had
anti-gas
properties
September 1943 - new scheme of MT brown special and Matt Black (again,
same as
Army) (Mickey Mouse pattern)
For the invasion of Europe, olive drab replaced the brown
Late 44 - Olive drab overall (vehicles to be repainted when neccessary)
This was the main pattern, but as always there are exceptions:
Overseas
BEF1939-40
Many vehicles painted in disruptive scheme of Khaki green in the field
Western Desert
Standard scheme was middle stone, sometime with dark earth in patches
2 TAF
Home markings, but with the white star
Far East
Standard Blue-grey until Burma campaign, when a general change to Olive
drab