The London Fire Brigade 'Charge Safe' campaign, linked to from the above article:
https://www.london-fire.gov.uk/safety/lithium-batteries/charging-electric-bike-and-electric-scooter-lithium-batteries/
Added to the OP.
@Oliver Schick started
London Fixed Gear and Single-Speed is a community of predominantly fixed gear and single-speed cyclists in and around London, UK.
This site is supported almost exclusively by donations. Please consider donating a small amount regularly.
The London Fire Brigade 'Charge Safe' campaign, linked to from the above article:
https://www.london-fire.gov.uk/safety/lithium-batteries/charging-electric-bike-and-electric-scooter-lithium-batteries/
Added to the OP.