Longer days were prohibited. Continuous users of electric had a 65% of usual consumption limit imposed. :)
Broadcast TV shutdown at 1030pm, a 50mph speed limit was introduced as was a low max temperature for offices (63F).
Hospitals, food shops and newspapers were exempt. Power cuts were often - but because of the regulations you knew when they were due. My parents collected a selection of camping lamps, a good supply of candles, and a single gas ring to connect to the mains gas point by hose as we had an electric cooker.
I remember much sitting in candle light wearing coats and blankets in the house.
This from a Conservative govt. The dispute and three day week ended when they lost the election to Labour.
A little more here: http://webarchive.nationalarchives.gov.uk/+/http://www.natio...