One of the reasons for the existence of Ofcom is to satisfy Europe.
I gotta say that I thought the UK was in the vanguard of "liberalising telecoms" (I hate to use the phrase "deregulating" here), in getting non-incumbent telecom companies involved in the eighties.
The UK was thus one of the countries (maybe the only country?) pushing the EEC/EU to ensure that other countries became just as open ... presumably to allow our telecoms vendors access.
Yes, we now have to reap the crop we sowed, but I don't think we can really blame the EU.
IMHO, the blame still lies in the regulation industry for allowing copper to be treated in the way it was for LLU ... and the UK is not alone. It was a european-wide affair. I suspect a lot of regulators saw the opportunity for their "competition" purposes, but closed their eyes to future possibilities for copper. After all, the EU set goals for "100Mbps" that they almost certainly expected to mean *only* fibre.