Will the smile ever leave Brexit Secretary Davis Davis' face?

It's not difficult to detect a spring in the step of David Davis.Despite the fact that he is the man responsible not just for extricating us from the European Union but fashioning our future relationship, he is clearly enjoying being back on the front line of British politics.Despite his claim that "huge progress" is being made, there is an arbitrary timescale of a fortnight set by Michel Barnier to come up with more money - not that Mr Davis recognises that as a deadline he needs to stick to.