not arrived yet, but in preparation of needing to send my ‘XT Mech’ back the following is useful:
https://www.amazon.co.uk/gp/help/customer/display.html?nodeId=GQ37ZCNECJKTFYQV
Looks like they need to provide a free return or you can claim a refund under an amazon guarantee:
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You wanted to return an item that you bought from an international seller but the seller didn’t provide one of the following:
A return address in the UK.
A prepaid return label if the return address wasn’t in the UK.
A full refund of the item without requesting the return of the item.
If the return request was authorized with an international return address, you must allow the seller 48 hours from the date of return request to provide one of these methods before you can request a refund under the A-to-z Guarantee.