Custom Paints has facilities in the US and UK, so it’s convenient on both sides of the pond. They have a variety of water and solvent based paints, in candies, pearls, metallics, color changing etc. So far I’ve tried one of their color changing water based color changers and silver. First air brush silver that I’ve been satisfied with.
If you go to their site, you can select US or UK at the top of the 1st page. Figured Clive, Andy and Iain might be interested.