Gents,
Found a handy link for Tamiya <-> RAL colour paint conversion ;

http://www.parabellum.co.uk/prc52.htm

eg,
XF11 = RAL 6007 - I'll see how accurate it is. Its a cheaper way to get RAL matching colours as Tamiya Acrylic paints are easily found. The odd links I found for RAL paints were all in Germany and thus more expensive to buy.

Al