36V 7Ah battery is only about 250Wh or something so a small capacity battery, a lot of proprietary parts and harsh aluminium forks for £1500. I have to say it doesn't appeal to me in the slightest. Seems more about cosmetic appeal rather than good value parts for your money. However I accept the belt drive and other bits are quite nice but its really about whether you want to go down that route of style over function. Gears are super useful on an ebike. There will be plenty of times you run out of charge or face a particularly difficult hill which the 250W hub motor and a single gear won't cope with.
I think the top end version of the Carrera Impel is £1500 and that has a battery probably about twice the capacity of this one and a decent range of gears over a wide range cassette. It will likely be stronger and more comfortable and have easier to replace parts. You can typically get a healthy discount by buying discounted
Halfords gift cards and sometimes there is a voucher code to use or a 10% reduction for various memberships to drive the price further down. You also have a place to bring the bike back to if any problems without resorting to expensive postage costs.