Electric Bike Legislation

Hi there, I am lookin to purchase a surron light bee. And u know yall are a very helpful bunch here so i thought id ask since my research has been futile so far. My problem is that i dont know whether its legal, if, then where it is legal. Whether i need some license and which one or whether a car license is enough. And whether i need to register it. The power is 6kw btw because i think that matters. All the official government websites only talk about pedal assisted bikes which this is not so i dont know how to deal with it. Thank you for the help in advance