RaiL2

Hello ! I just bought an Heljan class 56 / RAILFREIGHT / LARGE LOGO / unumbered and wish to make it a 56135 era 1985/1989, with its specific livery (as the BR LARGE LOGO is centered). So before entering the workshop, I have 2 questions : 1) Looking at the grey tone of the Heljan model, it seems darker than the pictures of class 56 I can find on the internet. As I got few memories about this livery, can you confirm the grey applied on the model is correct ? 2) In the eventuality I need to repaint the grey of the body (to apply the new centered logo), could you indicate me a RAL equivalent for the grey RAILFREIGHT colour used in the eighties ? Thank you for your help and cheers from Paris !