Beta Finishing in Hoddesdon will do thes for around £30. Number's on Yell.com

Comment in response to someone saying paint stripper will eat a frame. Never!! 

Modern day paint stripper is weak (health and safety rules), but metal is not broken down by this stuff whatever it's strength.

Dab it on, wait a few minutes, scrape off in log shavings with a sharp stanley knife. Use a soft brass wire brush (spark plug brush is about £2 from Halfords).

Use scotchbrite pads, wet n dry and wire wool. Use a Dremmel in really awkward corners.

Takes ages, is very messy and very boring, but the end result is awesome!

Some suggested finding a shot blaster and get them to do it in a few minutes with walnut shells, but didn't want to risk subjecting aluminium to this treatment (even though it's hardened) 

You can't go wrong with Bob Jacksons at Leeds HERE and they do a collect and return service

Check out what they do

Burnish and shot blast the frame

Etch prime and anti chip prime

2-3 coats with stoving in the oven and rub down in between each.

When I got the Evo  done it cost about £80.00 + decals from Orange.

1 year later still looks great.