But nobody is paying £70 for PS5 games - they certainly shouldn't be.
Currys will take £51 for the PS4 version of this game, which will net you a free upgrade to the PS5 version. If you want the PS5 version so you've got your copy of the game on the disc (so no downloading) and to match your library - £59.50
The pricing for HFW is only reasonable-ish because you can buy the PS4 version and get the free upgrade which makes it ~£50 most places. Something like GT7 for example on PS5 is £60-70 everywhere retail at the moment. Rumours that you may be able to upgrade from the PS4 version of that to ps5 for ~£10 though but that's not going to save you anything as it's ~£50 on PS4.
Most of the places selling the PS5 version are charging the full £70 and don't seem interested in offering anything off the RRP! I think it's very hard to argue against the fact that there's clearly a lot of price gouging going on when it comes to PS5 games!