With regard to the Comanche/Friedkin Spitfires in the US, it's hard to know for certain when/how often they are flown (unless you're connected directly with the operation), since they are all privately based (in the middle of nowhere) in Eagle Pass, Texas. The Spitfires Mk.V JG891, Mk.IX ML417, and Mk.XIV SM832 are all based there, and without seeing them on static display at POF, nor under overhaul/restoration anywhere, I'd say they are all airworthy/flying, just that they haven't been seen publicly at any airshows here in the US for quite some time (I don't think JG891 has ever been to any airshows in the US, ever since originally coming over from England back when it was still owned by Tom Blair). All three of these Spitfires can be seen in this ASB/Horsemen video, filmed at Comanche Ranch several years back, with SM832 and JG891 both filmed flying:
https://www.youtube.com/watch?v=59AA_QNoXOQWith regard to RN201 and PL344, both are based at Easton, Maryland, where they call home (location of Tom Blair's hangar/collection). I seem to recall that RN201 has transited (flown), within just the past few years, between both Tom Blair's home base in Easton, Maryland and Stallion 51 in Kissimmee, Florida (back and forth) - not sure about PL344 (which there had been a rumor that it was going to be shipped over to England again and flown during the 2015 BOB Anniversary season, but that didn't happen, and the most recent photo I have seen of it shows it parked inside Blair's Easton, MD hangar this past September.) I would say that both could probably be considered "airworthy-resting".
Although you don't mention it, Peter, the Spitfire Mk.IX MK959 also of course changed ownership early last year, and is now owned (and very actively flown) by the Texas Flying Legends Museum, based out of Ellington Field, Houston, Texas.