Geothermal Energy is in the process of scaling up in the UK with two recent projects in Cornwall.
“Enhanced temperatures at depth are most likely to be associated with the radiogenic granites. Outcrops of granite occur in the southwest of England, Northern England, Scotland, and Northern Ireland.” (ref. BGS)
So far most of the potential opportunities have been identified for district heating, but it appears that some areas for Geothermal electricity may be possible with Cornwall projects working on this opportunity.