Well the first couple of coats of paint are now on the chassis and axles .In the end after all the input and help from the good folk on the forum I decided to get the paint analysed/broken down by a local firm, who have been making paint since 1775:) .I paid an extra fee to have them break the paint down in their lab and try get an exact match to the original panel. They explained to me about pigmentation loss and other technical details due to its age . When I went to collect the paint they showed me a sample card they had prepared alongside the original panel , they wet the panel and the match was unbelievably very very close .The guy said they could keep blending but I was happy with what they had produced .The colour is matt in the pics it looks semi gloss , this is their version of SCC2 matched to the panel off the truck.Its supplied under the name of Transpeed (mixed with white spirit not thinners) which they supply to the bus companies, rail companies, airlines and coach builders .