If you have a cooker with a gas hob, you will not need camping stoves. Yes, the electric ignition will not work in a power cut but burners can just as easily be lit with a match or gas lighter, cigarette lighter or similar. The same applies if you have an all gas cooker. Light the oven the sme way you light a burner on the hob.
My memories of the power cuts in the '70s is that they were quite fun, all curled up in the living room with a couple of candles. If you were on the gas network than we almost all had gas cookers - and they were unaffected by the power cuts, those with gas fires - and many people relied on gas fires rather than gas CH and their sources of heat were unaffected by power cuts.
Many people offgrid relied on solid fuel or oil ranges, which had mechanical rather than electrical controls, so warmth and food were never a problem.
If we have any power cuts this winter, and it is highly unlikely, and this present scare is only because the National Grid have been their usual annual winter resilience planning, which means looking at everything, including supply failure.
I am on the liaison committee at a local power station and these sort of plans were discussed quite often at our autumn quarterly meeting. How tight supply was for the approaching winter, what would happen if catastrophe struck and there was not enough power. it was just sensible 'what if' planning.
The only difference is that, at the moment, there are more global risks that we are all aware of than in the past. In the past the risks were there, but most people didn't know that, so didn't worry about them.