So having had a couple of weeks to try and use the One, we've decided to send the One back and go for the HomePod instead.
We now have a better idea of what we're wanting for the house and while the One was a really nice speaker, I think the £150 extra to have everything under one ecosystem in our house was the deciding factor.
And I think the HomePod could be a one and done thing for us as opposed to having speakers potentially everywhere around the house.
I don't have anything negative to say about Sonos though - the delivery of the One was early and in the time that we used it, the One sounded really good. I'd happily recommend them to anyone.