The Natural Philosopher wrote:

we need at least 300GW (peak) to run this country in winter.

What is this 300 GW figure you keep mentioning? If you're talking about
electricity you're out by a large margin: 50-60 GW [1, 2] is nearer the
mark, and it's been about that for decades now.

[1]
http://www.nationalgrid.com/uk/Elect...nd/Demand8.htm

[2] Right now: Demand: 49805MW, Frequency: 50.00Hz, 20:47:45 GMT

--
Andy