Hi markjoy
Some valid points - I've heard from other sources that the technical stuff is already under development. I should keep more up to date with my own research!
I don't agree with your criticisms of metrication. Speed in metres per second equates in numerical terms to about half the value in knots. And it would be a pretty dim pilot who could not add or subtract 300 metres or multiples thereof. Pilots make many arithmetical calculations during their flight duties. As an example of everyday mental arithmetic, we Boeing drivers have to add 20, 40, 60 or 80 knots to Vref to calculate maneouvring speed during flap extension & retraction.
As I said in the article, the London TMA is frequently operating at capacity these days. I believe that the airprox hazard (or worse) is steadily increasing in UK airspace. Anything that can alleviate the situation is to be welcomed.