I've only just listened to this, in which Tim Harford tackles the assertion that "75% of UK law comes from Brussels".
As a summary, his conclusions are....
- That the people making that claim are dishonestly taking bits of information out of context to mislead
- That the figure is nonsense
- That it's largely impossible to arrive at an accurate figure in the first place, but if you did, it would almost certainly be a great deal lower
- That it's a stupid question anyway. Paraphrasing, he says "If the UK imposes nine bits of legislation on chewing gum manufacturers concerning packaging and other trivialities, and the EU were to abolish trial-by-jury, would it be of any interest that only 10% of UK legislation originated in Brussels?
I reckon that one would be quite high.