Not sure if you saw that it is a complete cash job, 1 man over 3 days. 2 days preparing the ground and 1 day to lay or 1.5 days for each.
Currently the ground is grass so not a great deal of work really needed. It is a guy I know and know his work, not someone knocking on doors or dropping in leaflets.
I am currently converting part of my garage into a fully functioning room for my man room, including installing a window, electrics, cat5e network points, plastering, doors and carpets it will come in at just shy of £1000. If you know the guys locally it can be done on a much much cheaper basis without cutting corners.
I know its not really helping the OP but it just shows you can get good work done for not much money.
Edit: I have just thought though about the location, I guess this could play a big factor in things and this is where the divide really will show.