Andrew
I also have a +4 2010 in the best colour that Morgan used. I had trouble finding the colour but on a Factory Day got help from them.
The Colour was introduced 2006/7 as Claret Red Met
It is a Glasurit colour MR170.50 and was Morgan Colour Code 30603.
That said I have been told that because of the famous UV degradation of Red as a colour it is best to get a good paint shop with a colour analyser to match and mix the paint.
I don't know of one that mixes touch up quantities.
If anyone on here knows of one that does please let us know.
Tony