Interesting, it's these sorts of not-really-noticable developments which can cumulatively have a significant effect on the fleet.The paint is actually quite an advance, it's helps with self cleaning the hull. It's been available commercially for some time but RN is now using. I saw the underside of HMS Albion and although she had been at sea for a while the hull was as clean as a new car in a showroom. A few spots caused by standing at the quay before going into dry dock; I was told it would just brush off as soon as she moved at any speed through water. It has the potential to push out the times between dry docking.
D'you know if the T45s have this paint? Diamond onwards probably does, given Edinburghs refit was 2010 and Diamond was commissioned in May 2011 I think.