I have an 800 Watt mobility scooter...DVLA have registered the VIN. & Issued a V5C Log-Book with a Registration Number which doesn't have to be displayed. It is Electrically-Propelled so Road-Tax is Free & Automatically Renewed each year. I have a driving licence, but I don't really need one to ride it...Insurance is Optional. Crash Helmet is not required. It has a top speed of 8mph.
Regarding skateboards, rollerblades & electric scooters & electric cycles ...etc. - - - I think that it is high time that DVLA were Dragged - Kicking & Screaming if necessary, into the 21st century ! - I live in a very hilly area so I bought a 500 Watt Electric bicycle, so that I could go up hills on it. It has a top-speed of 20mph.
It cost me £2000.oo but DVLA have turned it into a white elephant by declaring it a "MOPED" It needs an MOT test done by a special DVSA test examiner.
It will need Registration, Number-Plates, Lights & Indicators, Insurance & a Crash-Helmet........They have made it Effectively Unuseable. ( and unsellable too ! )
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Electric bikes: licensing, tax and insurance