Decals for model trains

[McColm]

 I finally got my hands on a 00 gauge Triang Midland blue Pullman with power car, dummy car and parlour coach.
I intend to change the current paint scheme, my thoughts turned to the Hogwarts Express , the familiar Orient Express coaches scheme could also be applied.
Which got me thinking of Airline companies that operate trains, the first two Virgin and British Airways.
I know that BA colours were applied on civilian helicopters, does anyone know where to get these decals from ?