I was tempted to get one of these until I looked at the Laws governing their use, although I don't see much evidence of it being enforced.

From the TFL website:

Electric scooters and powered transporters

It is illegal to use electric scooters (e-scooters) and powered transporters on public roads and pavements in London. This includes cycle routes and pedestrian-only areas.

The Department for Transport decides which vehicles are legal to use, and it is currently illegal to use electric scooters and other powered transporters in most public spaces.

Specifically, the law says that:

• On roads, anyone that uses an electric scooter or other powered transporter is committing the offence of driving a motor vehicle with no insurance. You could be liable for a fixed penalty of £300 and six points on your driving licence
• On pavements, it is an offence to drive a motor vehicle, and this applies to electric scooters and powered transporters. There are also separate laws that forbid them from footpaths and cycle routes
• Electric scooters and powered transporters can be used on private land. However you must have permission from the landowner or occupier

Some of these laws do not apply to mobility scooters or e-bikes (electrically-assisted pedal cycles), which are not treated as motor vehicles.

From the Department of Transport:

The law on using lightweight transport vehicles which transport one...