I too had an email from Tony along similar lines, in which he expressed an interest in my PCP Service. I sent photographs and the only schematic drawing I have, with the permission of John Walker, the creator of the PCP Service rifle.
I look forward to any possible future developments.

Having just seen Danny's post above, I've edited this post to say the current proposed Sterling Service rifle is NOT a PCP. It was only the fact that a couple of people mentioned my PCP Service at their stand that reignited Sterling's interest in the possibility.