Good thread! I recently had a solid Powder Coat experience for a Reynolds 531 frame here: http://www.keeppowdercoating.co.uk. They're on the Bell Lane industrial estate in Uckfield. £60 for blast then coat. Worth considering if you are nearby.
I wish there was somewhere that cheap in Kent. I couldn't find anywhere below £100 recently. I paid £110 here: https://www.performance-powdercoating.c ... ating.html. They did a good job, though. But that was for a colour that was already in stock. Phoning around indicated that it would be another £100+ for metallic or pearlescent!
+ 1 for Keep powdercoating had a Kona frame blasted and one colour for £50....6 maybe 7 years ago so if there only charging £60 now then its a a bargin top quality as well