It looks like Crash Bandicoot is continuing the streak of success in the UK with being on the top 20 charts of video games every so often weekly. For 2018, Entertainment Retailers Association has announced the top 20 best performing video games. Crash Bandicoot N. Sane Trilogy on all platforms (including PS4) has sold a grand total of 430,551 units, placing it in #7 (including digital sales).
This backs up the latest charts number of 1 million total units for the UK alone by Daniel from November 2018, combining the 2017 unit numbers (651,354) and 2018 numbers. The exact number is 1,081,905 total units in the UK alone!