Personally I've always supported the idea of a 'Europe of Regions'.
Regions are typically based on simple common interests while nations share a more broader interests.
I am fully in favour of cooperation on a supra-national scale but also see that certain regions have more in common than the nations they belong to.
I don't think it takes much imagination to see Scottish culture has more in common with the Danes, Norwegians and some Dutch than with London and Southern England.
Such cooperation is easily achieved with open borders and similar administration and taxation.
The present Tory government is against such, partially under the influence of UKIP.
Similar is happening in The Netherlands, because the press is largely lethargic on EU matters and like the infamous British tabloids more and more run on ridiculous headlines, we now have a significant anti-EU party that pulls on the non-left wing voters.
Cameron sees this and has announced to next week visit (among others) The Hague, no doubt in search of support of his efforts to dismantle social and consumer based EU legislation.
I think he'd better go to Hungary.