I think that colour really suits the car and it does look different depending on angle/light. I hope yours is the same in that the lacquer is really thick, so stone chips dont make much mess
You could try autolink, they are just down the road from me http://www.autolinkuk.co.uk/ I think they mainly do mk1 MX5's, but you never know. The chap there is pretty good so he may be able to recommend someone.