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Wasn't aware blackouts were a significant problem in the UK. Great device for moving away from fossil fuels though

They aren't particularly, but there was a fairly large one last year, and grid stability is become harder as more and more of its energy comes from renewables (as the article mentions, the grid is favoring fossil fuel power sometimes in order to keep things stable).

This might interest you:

https://www.ianvisits.co.uk/blog/2019/12/10/watch-a-power-st...

"The power plant was notable for being one of the few that could restart generating electricity without an external power to restart its generators in case of a wide-scale power-outage. This was partly due to cold-war concerns that an attack could take out London power supplies.

To be able to restart the plant, it made use of versions of jet engines based on those used on Concorde to jump start the main generators — and they were used to keep the lights on following the October 1987 storms."

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