What elephant said, it's about showing energy rating, as we have for fridges etc with no problems.
And the EU hasn't been causing problems with jam. It's been a domestic legislation issue. Which has had a negative impact on UK manufacturers selling into the (huge) European market place. Having consistent EU rules would help.
For info, the EU does publish impact assessments and consultations on new policies. The UK has democratically elected representatives in the EU, and our ministers get to vote on new legislation too. The EU isn't just made up of foreigners, we do get a say too.