No worries Dave,
The pic of 510 at Glasgow showed it with black headcode box. It's funny that although 510 used to follow me around I don't seem to have any pics of it. 47444 was another loco that I used to see a lot of, 33018 was another one.
Why not keep the Heljan 47s they are not that bad are they? I must admit I don't have any myself but yours look fine.
Cheers Peter.