Well, two posts down I asked and, lo, Russ Roberts of Cafe Hayek answered! For those with short memories (and who wants a long memory for the sort of rubbish you find here?) the question I posed was "Why do they keep changing things- sod it?" And here is the answer:
Mind you, I have no idea what that little 'gizmo' is that he's holding in the second picture and as for actually making it work - well, my dears, simply too, too embarrassing!