First off, how much of British electricity consumption is unnecessary for sustaining the British standard of living? And how much of the electricity used to maintain Britain's extremely lavish standard of living is actually necessary for sustaining human life?
Double the price of electricity (by government mandate) and require more energy efficient products. Electricity consumption per capita will decline and can decline quite dramatically without causing a permanent depression or mass starvation.
The picture is somewhat difficult to read so I'll explain. The top orange line is per capita electricity consumption in the USA as a whole while the yellow line tracks California. The green line is New Zealand and the dotted green line is what New Zealand's future would look like if they implemented a particular kind of energy conservation.
Basically the graph shows that in the 25 year period of 1976 to 2001, electricity consumption per capita in California was essentially flat, despite a booming economy.
So it's certainly possible to maintain your economy (heck, even grow it considerably) without increasing electricity consumption.
Moreover, why should natural gas run out any time soon? Build a dozen LNG terminals and you can flood the UK with cheap natural gas from the Middle East and Russia. And if you tell people that the alternative to building an LNG plant is rolling blackouts (and give them a taste of those blackouts), they'll cave in and let you build them.
Peak Uranium is way out into the future and the cost of fuel is a tiny % of a nuke plants operating budget. Again, allow a few blackouts and the British will cave in and let you build a couple dozen nuke plants on some sheep pasture in Scotland somewhere.
Not to mention the dozens of alternative/renewable energy sources that can produce electricity at a relatively inexpensive price. I'm not too worried about blackouts do to a lack of base load electrical production. However, we might get blackouts at the peak hours and if the equipment falls apart.
The problems associated with Peak Oil mostly consist of finding a replacement liquid transport fuel and a replacement chemical feedstock. We could maintain our electricity grid with 5% of today's current oil production. But we couldn't run suburbia or our throw away culture on that fraction. Thus the need for increased awareness about the issue and preparation.
$this->bbcode_second_pass_quote('', 'W')ithin 8 years, electricity could disappear in UK as North sea production is collapsing.
1/3 of British electricity is produced via natural gas.
Even if somehow that 1/3 were to vanish in the next 8 years, they would still have the other 2/3, ignoring any growth in non-natural gas electrical production.
A 1/3 shortfall would be devastating but it wouldn't lead to anarchy. Electricity can be rationed and reserved for only the important uses.