You'd be surprised at the amount of geothermal boreholes advanced on a daily basis in the UK, most of which are either executed by Irish or French firms for domestic and commercial clients. The market is expanding rapidly, with 'everyman and his dog' trying to get their share, especially since there isn't a great deal of work in geotechnical sector at the moment.
In my personal opinion, I feel that the larger projects such as Heathrow T3 should have been given more coverage in the press in order to 'pave the way' for similar projects which are under construction or currently awaiting funds.
There are also rumours (with a significant weight of truth)that E-on/Central networks are routing funds into geothermal installations for gas customers which are currently beyond the reach of mains gas and, by doing so, are taking on the likes of Calor, Shell and Flogas not to mention the domestic oil firms as well.
Interesting times to say the least....