Don't know what others will think, and this may give you more than you need, but if you go to Halfords, they'll give you rattle cans mixed to the correct paint code from the plaque under the bonnet. Not cheap but...
I needed a bit to spray a rear lower quarter panel on my Anniversary which has a special, tasteful, flip-flop paint, and they matched it absolutely perfectly. and sold me a can of clear coat, which worked fine, and it has never bloomed peeled faded or anything. Can't tell it from the original, and I am no paint finisher!
This was a few years ago mind.