London Underground station Clapham Junction this evening
Or something more sinister?
We may never know.
Large parts of the country were without electricity following the power cut, UK Power Networks said, with outages reported in the North West, South West, the Midlands and Wales.
The UK Power Networks tweeted on Friday evening: “We’re aware of a power cut affecting large parts of London and South East.
“We believe this is due to a failure on National Grid’s network, which is affecting our customers.”