So I've made some progress n this little guy, added the decals and then resprayed the area around those to help make them look less as though they are sitting on top of the surfaces. I used Mr.Mar? to set the decals, the one on the rear radiator the only one that gave me any trouble, with it being forced into co-operating in the end.
I then did a very dark wash with paint thinner and artist oil paints, black and raw umber. This was allowed to dry overnight and then I used Q-tips with a little paint thiner to remove the excess from the flat surfaces and high points, aiming to leave the dark around the details.
With that allowed to gas off and dry for a day I then did a flat clear coat (Humbrol) over which I decided to do a little dry brushing, not the usual sequence, to give the filters which were to follow something to have shine through, plus some of the paint was unfortunately removed from some of the high points during the removal of the oil wash.
Then I will do around 3 "filters" followed by the "oil dot" method to help break up the surface and give the grey some more flavour, and help tie everything together. Then I suppose I'll give a layer of dust and then maybe a few "chips". Not chips in the paint per sae but maybe marks in the dust.
After I did the flat I actually used some very thinned down grey to try and portray the decals to be a little faded rather than leaving them hot white as they stood.