In reply to owlart:
You live in the wrong part of the UK ! At least, it's wrong at the moment, but plans are afoot to change that.
There is a FabLab in Manchester. This would be ideal for what you want to do. There are plans for a FabLab in Brighton. If you are going to be doing more of this sort of thing in the future, then perhaps you should contact them (
http://fablabbrighton.org/contact/ ). I don't know how soon they expect to open, but I am sure they would be happy to hear from you.
If it is anything like the Manchester one (and it should be), then you will be able to get help learning to produce the 3d printer file, and then printing the object, paying only a nominal charge to cover costs of materials for the printer.
Rug