There is still some confusion on the Amazon pages on both sides of the pond. The page clearly says vinyl and SACD but when putting the order through it still comes back as vinyl. Looking further down the description it says:
Vinyl (28 Dec 2018)
Number of discs: 1
Format: Hybrid SACD
Other editions: Audio CD/Vinyl
Although I've ordered and cancelled once because of the confusion I'm going to take a chance and re-order as it's only the SACD that's being released on that date. Don't want to miss the boat again and have to pay the secondary price in a few months.