All this talk of vintage gas and paraffin heaters make me think we're going to see an a rise in fires and carbon monoxide poisoning, as people resort to sketchy methods of heating and lighting. Probably less of the Texan phenomenon of running vehicle engines in garages as a way to keep warm or provide electrons, if only due to the price of petril.
As someone who's too young to remember rolling power cuts[1], I'd assume they'd be limited to an hour or two at a time, which should minimise the effect on public health (food spoiling, impact on space heating, within the battery capacity of essential medical devices[2], etc.)? Would we get advanced notice? Would that lead to a surge in demand? Who knows?[3]
[1] I was in ABROAD, where the power cuts were spontaneous.
[2] Barakta's tales of being thrown in the car to drive to the howling wastelands of Stoke in search of electrons for the snot-sucking machine are surely a product of 1970s battery technology.
[3] Presumably not the Prime Minister, on account of him being habitually absent from such meetings.