Racingrigger is right. 818 was a 49 Sqn machine before the test ban treaty and took part in operation Grapple. I know because it is my logbook. All Grapple aircraft had the reinforced wings because it was feared that the blast wave from a weapon might prove too much. It was certainly a bit bumpy but it felt no worse than moderate to strong turbulence. Are you sure that 818 went tanking? 49 went to Marham after our fun was curtailed and became main force. When the Valiants were grounded and 818 was to be parked outside the Ops block I was its inventory holder (a secondary duty for co-pilots). I collected all the paperwork, both flying and technical, bundled them up, had then vacuum wrapped and left on the nav's shelf. Never knew what happened to it but now I do. It's living with my Pucara!