I tend to agree with Kissngate. Think people are stressing far too much about this - probably will not happen.
Always good to have a few emergency supplies at hand, ie candles, torch, etc. but not to go to the point of purchasing alternative cooking or heating methods, etc. It is not as if we are talking about a total stopping of gas and leccie for days or months - at the most it will be for a planned three-hour session. Think we can all manage to survive for that short time.
The cuts in the early 70's was for three hour periods, and we knew exactly when they would be - all scheduled. So funny now to think what we found important back then. No central heating, most of our heating was gas fires, and I cooked on an ancient gas stove. However, had small children, and it was so important that they still had their bath playtimes each evening, that my friend and myself (different parts of same London borough), would go to each other's house to avoid those blackouts so children could still have those baths!!!! Can remember that the period I most detested for these was 7 -10 pm.
Freezers and even fridges will not be any problem if leccie is off for three hours as long as people do not keep on opening them.
Relax everyone.