reply to myself because I ran out of time for edit
It is a shame that this is too big an idea for the Tories to grasp. They would rather waste billions building Nuclear plants at many times the total cost even though much of the technology is shared but SPTs are much safer and cheaper.
Probably take less land area as well once you count the exclusion zone around a Nuclear plant. Also if you build the store slightly further away, it would provide great free heating for greenhouses to allow growing tropical fruit etc. in UK.