Where is that?

This is referred to as "Minimum Energy Efficiency Standards (MEES)" and seems to have been pioneered in the UK and adopted by Netherlands and France and then the EU generally.

IME the people estimating energy efficiency in the UK do not recognise heat pumps and often misclassify them as less efficient systems.

I believe the EPC is being updated to fix that and googling suggests it has gone into effect a few months ago.