Has anyone done any of the blue cravens yet? Don't think I've seen them modelled. Not a fan of the real livery but a preserved current RPSI craven rake would make an interesting model.
Shawplan Laserglaze. Expensive but looks damn good http://www.shawplan.com/extreme_coachandunit_Laserglaze_4mm.html
I think southeastern Finecast do it too.