I may be missing something
But doesn't this require running expensive backhaul from rural church buildings to the main network?
Given that a large part of the Church estate was built to support a massive rural agricultural labour force that has sinced moved to the cities, the majority of the buildings are now probably just sitting on their own in the middle of massive fields and fuck all else.
This reads like a cosy Ministerial sound bite which distracts from the real problem of getting the infrastructure out to these places. I find it hard to believe that the only think preventing rural phone and mobile broadband deployment is the lack of suitable mast locations.