I went to HMV this morning and added four titles to my Premium Collection, taking advantage of the 2 for £15 pricing. Thanks to Casablanca, there isn't a gap between 47 and 49 any more, and the other three are numbered 51-53. I intend to buy the rest of releases while they are priced like this, whether in store or online.
At the checkout, I noticed Sicario was priced £9.99 for those with a Pure Points card. I'm trying not to upgrade to many from Blu-ray to UHD, but this is apparently one of the best reference quality discs, and a bloody good film.