Reasonably priced laser cutting service in the UK?
I suppose this question boils down to what you consider a reasonable rate, too? I have no experience of the going rate, are we talking a couple of quid, or £50-100? If there just isn't anyone you can find locally then maybe it's time to build your own. It's been posted before, but here's the link to the Instructable about building your own laser cutter for less than 50 dollars, I suppose it also depends how many times you'll need to use it.

Some Secondary schools have access to laser cutters, maybe trawling through some of your local schools or colleges might throw some up. You may be able to do a deal with them, ie share some of your technological know how with them in exchange for some laser cutting, maybe a robot building session or a talk about programming to some VI Formers. What about the University of Surrey, do they not have anything?