Not sure if this will be region free as it was released in the USA too. It depends if they used the same discs so decided to take the region lock off, or if they produced different discs for the USA and UK.
I know a lot of Arrow releases are locked to region B, so best bet is ask them. Arrow's website does list as region B though...
Also, Zavvi's listing says 1 disc, Arrow's release is 2 discs, so either they're skimping and only including the first disc, or they're crap at listing product details.
However... Arrow's listing says:
- Brand new 4K restorations of both the Theatrical Cut and the Director’s Cut from the original camera negatives produced by Arrow Films exclusively for this release, supervised and approved by director Richard Kelly and cinematographer Steven Poster
- High Definition Blu-ray (1080p) presentations of both cuts
Zavvi's says:
- Brand-new 4K restoration from the original camera negative produced by Arrow Films exclusively for this release, supervised and approved by director Richard Kelly and cinematographer Steven Poster.
So, Zavvi's doesn't list both cuts, so probably 1 disc.