The drop is pretty standard for Zelda and Horizon Zero Dawn also has stock problems.  Digital sales for Horizon will be higher too. The game is just selling better simple as. 

So let me get this straight

We can have a hundred threads about Zelda beating Horizon around the world, but he can't post a single comment about Horizon beating Zelda in UK?

Give me a break

Your probably right I was actually thinking about this the past week myself but I think it's more so them knowing that the digital copy is avaliabe and if people want it now they can just get it and they take a bigger cut anyway instead of fast tracking physical stock so they don't loose out on sales.

Singleplayer games really can't afford to be out of stock for a week or two imo as the market can get completely flooded with used copies as early buyers trade it back in after they finished it a few days or a week after launch whilst the value is still high.

Zelda Wii U version also holding up so that's good to see

Average 2nd week drop is around 80%, so those are really good holds for Horizon and BOTW.

actually average week drop is in the 70's for an AAA game. 80% is considered on the high end of a drop 

Yes talking UK. I've already read about the stock issues and keep visiting shops and checking availability online. It's quite virtually impossible to get one, and when they do get stock it gets sold out in a couple of hours