Thank you all for the help and insights 🙂
I think the UK price seems similar to the US price (as we don't have a great exchange rate with the rest of the world at the moment)
The free upgrade looks to be on 2024 but saying that, the 2025 prices look slightly lower (although there is no exact comparative to our cruise itinerary)
I think if the ship was larger, last minute in the UK usually gets a better price but as Azamara has smaller ships, I'd imagine that they fill up quicker?
Again, thanks for your help and as the itinerary is just what we are looking for, I may just go ahead and book now 🙂