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I got mine from TQ Systems GmbH HPR50 Drive Unit Set | Tree Fort Bikes for 836.99 usd or 621.74 GBP. So similar cost if they would even ship to the UK.It seems that in the UK, silverfish are the new importer/distributor, and on the website you can now buy a new motor.
It's £799
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Mine is exactly the same at 2200 miles. It’s gotten much noisier under load And resistance when Turing wheel against the motor (backwards) seems to have increased.The main bearing (the one that the chain ring rotates on) is really noisy and feels rough when it rotates, it makes the sound a wheel bearing makes when it has lost all it's grease and has gone slightly rusty.
Plus there is more resistance when you turn the cranks than it used to have.
The motor still seems to be working fine, but it doesn't sound or feel good.