I can only speak for the situation in Aberdeenshire but farmers local to us therefore in rural locations that do not have 3 Phase electricity supplies installed have very big problems getting and in many cases are refused 3 phase supplies.
I assume it is probably the existing local network capacity is at it's limit and that would require the supplier to reinforce the local distribution network
In another case of a very large house in the country side that was being refurbished, where the electrician approached the electricity supplier for more than 100 amps he was very firmly advised that 100 amp was the maximum that the supplier would provide. They refused a second supply to an outbuilding.
Again this may well be a local capacity problem and not a country wide issue.
