Morgan have touch up paint kits. I got one with our car. It is not listed in their on-line shop but the Chipex Touch Up Kit is on the Price List for the cars. It is listed at zero cost and should come as standard with a new car. Given that you have a standard paint colour I imagine you are pretty safe going with Chipex.
PS. I found the short video very informative.
http://www.chipex.co.uk/instructions-i-18.html