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Wow, the bloody British have invented a new system that has only been in use in American homes for 20 years. At this rate the EU will catch up with America in about 300 or so decades... Using well pump heat sinks is very old technology. A more advanced version pumps water from one well, uses it in a heat exchanger in the cooling system and pours the used water back down another well. Rather than risking contamination of the water table, or saturation of the well with heat or cooling buildup limiting your savings, you return the unwanted thermal load to another well and as the water flows between the two wells it transfers the heat to a much larger area. And as a bonus, you do not need expensive special refrigerant piping and special systems.

But give um another 20 years and they will figure that out too. Bloody brilliant they may be, but sometimes it helps to read a trade mag or two from America.