In message , n cook
writes
What a swiz, I wanted to see what the real time meter would do at 19.15
tonight
Wouldn't see any difference. The TARDIS has an internal power supply
and is not reliant on a connection to the National Grid.

Whilst it doesn't cover frequency, this site;

http://www.bmreports.com/bwx_reporting.htm

covers system demand (takes a few seconds usually for the graphs to
load) and other commercial parameters, today capped out at just over 38
GW demand.

Cheers,

Andy
--
Andrew Sinclair http://www.smellycat.org