Bristow S58T's had a fuel jettison system on the external aux tank. I can't recall if the Wessex had the same/similar system.
I also seem to remember someone taxying out with the S61 and inadvertently initiating the fuel dump, instead of arming the system. When they finished taxying down the runway, and turned into wind, they suddenly realised where the fuel smell was coming from - and all on a freshly resurfaced runway!
Apparently they had to use great caution with the goose-necks that night!
