more and more single seaters are being converted over to twin seaters to satisfy the demand
Far as I can work out there are six Vickers modified two seaters still flying, plus five "new builds" - two started by Dick Melton in the 1980s/90s and three more recent "conversions" all using new build fuselages, one still to fly. All Mk IX except for the prototype G-AIDN which is a VIII (and which I was pleased to see flying from Biggin last weekend
). That isn't to say that in due course further "data plate restoration" Mk IXs won't emerge with a second seat I guess...