According to British Civil Aircraft Volume III: "The first, rolled out 8/10/63 as G-ASKE, was first flown 5/1/64 from Sydenham to Aldergrove as XR362 by D Tayler and P Lowe." Used civil marks for hot and high..." etc.
Can't say I've ever heard of D Tayler, but the section on the Skyvan says he was Short's CTP.