It's the same pattern as all of their recent 4k releases I'm afraid. Fancy 4k box set with all nice extra stuff, then a standard blu-ray which you're lucky if it even includes extras on, usually with a slipcover. and then a month or two later a standard 4k release as well.
This has been the case with Flash Gordon, The Elephant Man, Total Recall, Don't Look Now, the John Carpenter films, and a few Ealing comedies as well.
At least the Bluray will be £25 cheaper and still look fantastic