The files necessary to make the boards are in the SVN so you could create your own boards, for example; using a laser printer and toner transfer to mask the board for etching.
The parts finder should have references to UK locations for the components, but I've not used it in quite a while and only for the PIC electronics.
In the end I used boards from RRRF and components from Farnell
All that said I doubt you would regret buying the complete kit and saving yourself from ferric chloride and several evenings of going through parts catalogs.