@adusum a lot of Reform and other right wing supporters are in skilled trades (they managed to put up all those flags involving working at height during darkness without too many of them hitting the deck and could be sabotage risk)
Pro-hunting lobby already tried sawing through a 33 000 v electricity pole a few years ago and nearly brought it down.
There may not even be attacks prompted directly by nation states, but taken as action after localised disputes, for instance in Northern Ireland following a dispute over pay at a medium sized family business someone poured petrol into the VDSL street cabinet and lit it up - a whole section of a town was without phones/broadband for 3 weeks whilst Openreach repaired it (although they can fix the effect of vehicle strikes within 1-2 weeks)