Found a useful reference to RAL codes. Shouldn't be considered accurate for actual tones but gives a good idea.
I read on here somewhere that MK can do bodywork in any RAL colour.

http://www.stephen.hull.btinternet.co.uk/ral.html

Pigment companies such as West&Senior use RAL colours so any GRP manufacturer can make their panels to any RAL colour, For example GTS just made a full GRP set in Kawasaki green, a bit too green for my tastes but each to their own i guess.

My bodywork is a RAL colour. I recently got some replacement pannels made. The GRP company bought in a tub of the same colour gelcoat pre-mixed and the colour is an exact match. MNR can therefore supply any RAL colour you choose, though I believe some colours cost more than others.

I'd also add http://www.e-paint.co.uk/Colourchart.asp?pType=&pFinish=

Anyone know the code for "Cadbury's choccie purple"?

Colours like red and orange are always more expensive, don't know why.
Red is always a pain to match because even if you manage to get the RAL code right, if the panels are quite old then they will have faded as well so you still don't get a match.
I hate mixing orange pigment, it never seems to want to mix as well as other colours and the finished item can have streaks in it.

Ah looks quite like RAl 4012, Perl Blackberry