I got my old Orange Clockwork frame powder coated grey at Triple-S in Bingley. Although not as shiny as a wet paint finish it was shiny enough for me and very tough.
Cost about £60 and that included a full paint strip and re-finish. They know what they’re doing so all threads etc are protected. Recommended them to a few others and all have been very happy with the result. Check out their website because they offer a courier service if you don’t live nearby.
Think it defo depends where you go as I know some people that have used other firms and not been happy with the result.