That's a good price. The going rate in Leeds is £40ish for a frame. I got a frame only blasted and powdered for £25, plus £5 for metallic lacquer. It looks great. Forks would probably add a tenner or so. Black or white might be cheaper.
You can get a frame and forks stoved one colour in Leeds for abouit £70, a pal did this. Obviously decals are extra, and you need to lacquer over them after application. If you want anything clever, you are going to have to spray paint over the basic powder coat or pay the stover extra to do it for you. This is likely to take you over the £100 mark.
A basic powder coat is fantastic value, you could waste a weekend with sandpaper and aerosols, spend more money and still have the thing look awful. I have a bright orange metallic MTB frame, it looks fantastic and cost £30.