“The entire idea of the 'chip' passports is to speed up the process.”
Well if that’s the aim, Eddie, they singularly fail to succeed. I’ve used the new booths and quite simply they don’t work properly. They don’t work at all if you are under five feet tall (unless you carry an orange box with you). If you are of regulation height they frequently fail, necessitating manual intervention from an official (rather like the do-it-yourself checkouts at supermarkets). They need to become a lot more slick and user friendly before they can hope to speed up the process.
I have made a careful study of this on my returns to Gatwick (which I make five or six times a year). On every occasion without exception those using the manual queue get through immigration far quicker than those using the new type. A lot more work required.
As sunny-dave relates, the main achievement of Border Control gates (whether manual or automatic) seems to be to cause unnecessary delay for passengers. The very first change that is needed is that there should be separate gates for UK passport holders here in the UK. Most other countries I have visited (certainly those outside the wretched EU) seem to provide dedicated gates for returning citizens to avoid them having to queue up behind the world and his wife.