The similar per unit (usually per g, per kg, per ml) pricing is a recent addition in UK shops, only in the last 2-3 years as I recall. So while Sweden had this

The similar per unit (usually per g, per kg, per ml) pricing is a recent addition in UK shops, only in the last 2-3 years as I recall. So while Sweden had this as a national law w/o EU pushing it, I rather suspect the UK now having the same is due to Single Market harmonisation - i.e. an EU rule. That is what the SM does.