Just now seeing this pre-order listing at iTunes, vol. 1 of an Alexander Mackenzie piano series with Christopher Howell. I searched to see if this had already been posted here, but I'm presently onboard a ship sailing away from Greenland & Iceland :o, and internet search is particularly slow and spotty, so apologies in advance if it's a duplication.
https://music.apple.com/us/album/mackenzie-complete-music-for-solo-piano-vol-1/1477203191 (https://music.apple.com/us/album/mackenzie-complete-music-for-solo-piano-vol-1/1477203191)
Also at Amazon. Searched Presto but don't see it yet.
https://www.amazon.com/Mackenzie-Complete-Music-Solo-Piano/dp/B07WTQQV9T/ref=sr_1_5?keywords=Mackenzie+Howell&qid=1566594571&s=music&sr=1-5-catcorr (https://www.amazon.com/Mackenzie-Complete-Music-Solo-Piano/dp/B07WTQQV9T/ref=sr_1_5?keywords=Mackenzie+Howell&qid=1566594571&s=music&sr=1-5-catcorr)
Jolly good. The Sheva label has already done Stanford proud with cycles of the complete piano music and complete works for violin & piano.