Looking for Colour choice for Quad Tractors and 25 pdr canon that were operated by the RCHA units that operated in Sicily and Italy....Black and White resource pics don't help and many museum/restoration pieces are done in Europeen theater colours...and most painting guides are only showing Africa mickey mouse themes

Have you looked at Mike Starmer's work on www.MAFVA.net? He explains the schemes and provides suggested mixes based on his years of research.

Indeed. Mike's work is pretty much the go-to standard for Commonwealth camouflage and his mixes are really good.