There was a recent thread on the Matchbox H.P. Heyford kit. For the benefit of the Gent who was interested, the "Kits at War" branch of Dutch Decals offers sheet #K7/12 which contains markings for two #10 Squadron R.A.F. Heyfords, one each from "A" and "B" flights. Hannant's would be a source.
Bill Shuey