Morten Dam of Peoples Movement Against EU in Denmark contrasts Danish referendum result to keep the Justice and Home Affairs opt-out with the UK government discarding the opt-out without so much as a debate in Parliament.

This does rather show David Cameron's contempt for parliament as well as the idea of repatriating powers from Brussels.

The JHA opt-out included the European Arrest Warrant which is a serious reduction in traditional Common Law rights in England as well as under Scottish law. Serious criminals are dealt with by conventional extradition but ordinary people can be arrested on the order of a foreign prosecutor without evidence.