Just copy and paste to send a link.
https://www.richbit.co.uk/
Interesting bike. Not road legal as an eBike as Nealh pointed out. I've no experience of it but a few comments.
The 1000w motor probably isn't 4 times more powerful than a typical 250w rated one; the 250w is a continuous rating and most can deliver much more. Some intentionally understate their power to satisfy the rather curious legislation. It doesn't seem to say whether the motor is geared or not; high power ones often aren't. That can make a big difference to how effectively it uses the power. However, it is probably still a lot more powerful than a (nominal) 250w one.
A very capable battery (17aH, 48v = 816wH). With a battery like that many more conventional ebikes would quote a 100 mile range.
An Amazon anwser to
Is this road legal in the UK? that says
We recommend using this e-bike on private land. If you want to use it on public roads, you can limit the speed to 25km/h. is incorrect (or at best, incomplete). Even with the speed limited to 25km/h this would remain illegal as an uninsured, untaxed eBike.