Check out this guy's blog. He attempted an ultralight fixed tour much like the one you're planning up through the UK, on a steamroller. He has gear lists etc. He rode with Surly hubs, and the bearings got ****ed up. From hearing so many bad stories to do with surlys bearings, I would choose formulas or maybe phils.

http://www.fearlessgearless.com/2008/07/fixed-across-uk

If you msg me I can give you the name of a dude in Vancouver who rode a brakeless track bike to Mexico.