What happens if you need warranty work ?
That can mean sending anything bought from the US back to the US
But it depends on the manufacturers support system, they may have UK support and let you use it
UK support is often through UK retailers who have gone through the effort and expense if doing the importing at the trade level.
Why should they warranty & tech support people who bypass them?
If you go to an events tech support they don't normally check serial numbers and aim to value customer service, they may notice and politely observe its not a UK model