Can you order a computer online? Where we lived in Australia, finding cycling-related stuff was difficult because we were quite remote so we ordered most things online.
You might check to see if UK companies will deliver to you. We found that North American companies were more than happy to charge an arm, leg, and first born to ship stuff to us in Australia, but the shipping was often free or very inexpensive from the UK.
Check sites like Wiggle, Chain Reaction Cycles, Ribble, SJS Cycles, ProBikeKit ... and see if there's any way they'll ship to you.