> On 10 Aug 2019, at 19:37, Ralf R Radermacher <[email protected]> wrote:
> 
> Due to the loss of those two power sources the remaining sources were
> put under more load and their generators were consequentially slowed
> down. This in turn lead to a drop in mains frequency which is very
> tightly controlled throughout the whole of mainland UK.
> 
> As a first measure, they simply cut off parts of the country and most of
> the rail network in order ...

...for London's espresso machines to remain fully operational

> 
> Here's a more detailed explanation:
> 
> http://mainsfrequency.uk/fm-home
> 
> The current frequency can be seen here:
> 
> http://mainsfrequency.uk/fm-meter
> 

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