Hi Rialto, Weshty is the man for the decals. As Georgeconna says "its knowing when to stop" with weathering and everyone sees colour differently but the loco and tender do look very decrepit in the flesh! I need to source some snifting valves to go on the smokebox & running plate and I would like to fit a GSR/CIE smokebox door but I know of no source, maybe one day!
Parkside; BR 12t van Plywood sides stock code PC 08A £9
BR 12t Palvan stock code PC 65 £9
BRM has one of there annual compendium mags out at the moment and I picked up the George Dent techniqe from there. The mag is a good buy as there are a number of articles about airbrushing, which one is for you, maintenance etc .