Why does the DVLA not require electric bikes and scooters to be registered?

Why has the DVLA not required Electric Cycles and Scooters which can and do travel at far higher speeds than Mobility Scooters to be registered? Especially as Electric Cycles can be ridden on the pavement.

Do you need a driving licence for an electric bike?

I understand that electric scooter riders require a driving licence to use, is the same true for electric powered bicycles, and, if so, is a provisional sufficient?

What are the rules on riding battery powered bicycles on the road?

I am looking to buy a fold-up bike to half commute to work. I have found one that I want that has nice fat tyres, a 250w motor and can go up to 15mph (according to the spec sheet). What are the laws surrounding...

Can you ride an electric scooter or hoverboard on the pavement in the UK?

I just read an email from you in which there is a review of the Micro Sparrow electric kids scooter. A few days ago, I received an email from Surrey Police that said that all powered vehicles (which include...