Indeed! Seems some (or most) of the manufacturers aren't that bothered either with their responses being "fit a modern engine like an LS/ecoBoost/etc*" *delete as applicable depending on if you're talking to a Cobra replica manufacturer or 7-clone manufacturer..
So they've dropped this neatly into the "too difficult to fix" box then
.. or the "We can sell you a crated LS for just £xxxxx" box.
I think it'll hit some kit car manufacturers hard - especially those making replica kits that need air cooled engines to be anything close to authentic, for example, and those who tend to attract lower budget builders whose engines turn up in a pile of cars at a scrappy not on a pallet from Ford.
Remember also that it effectively ratchets up the emissions standard with each change in MOT emissions - so when that requires a GDI engine and the associated management where will we be then?