Not legal on any public areas in the UK.
Not without their problems in Paris:
Tragic first fatality:
https://www.francebleu.fr/infos/faits-divers-justice/paris-un-accident-mortel-de-trottinette-mardi-soir-dans-le-quartier-de-la-goutte-d-or-1560238319
(in French - collision between a van and a scooterist who allegedly failed to give way to the right)
And 85kph on the motorway:
.
The hire scooters are speed limited to 25kph (same as a e-bike), but I'd have thought that 12kph limit would be more appropriate (i.e ~human running speed).
Also: mobile-phone-use to film while driving!
Discuss...