IXELL UK paint stockist

[Rosanne]

it is painted a dark grey colour.
the paint details that came with the car paperwork refer to it as a General Motors (5358) Gunmetal. It also states that the paint used is IXELL H.S.
My local paint stockist tells me that this is a make of French paint used widely on French cars, but unfortunately he does not stock IXELL paints.
does anyone know how I can discover my closest IXELL stockist (I live in Bedford).
the IXELL website is not very helpful.

thanks, Rosanne