http://www.parliament.uk/education/about-your-parliament/how-laws-are-made/
Can't see anything in there about the EU.
But as Professor Anthony Arnull, an expert in European law at Birmingham Law School explained to FactCheck, to truly make an assessment you would have to look beyond the numbers, at a more precise level of UK legislative detail.
He said that because of the UK’s remaining jurisdiction over key areas such as health, education and defence – as well as the sheer difficulty in measuring the UK/EU law balance – it meant the 75 per cent claim was unlikely to be true.
Prof Arnull added: “The claim, in a sense, is meant to sound like a negative by UKIP, but often we [the UK] would have implemented these laws anyway, or even initiated them – so that would need to be taken into account too perhaps.
“While if you have a piece of legislation with 200 sections, and one section comes from the EU, does the whole act then get defined as ‘from Brussels’?”
It’s also important to keep in mind that the EU’s powers are mainly regulatory, as opposed to budgetary. So the volume of laws might not always translate into impact and importance either.
The fact the UKIP figure was based on a six-year old German analysis, which in
itself had flaws, is enough to suggest this claim is a step too far.
Clearly this is a complex issue, and difficult to prove, but there is a lack of evidence to suggest 75 per cent, or even half, of the UK’s laws now come from Brussels.