A SWO is a RAF 'Station Warrant Officer', a character to be feared.
When based at Watton 3 of us got snowed-in at Swanton Morley after an evening on the piss, all that was visible of my mini was the roof aerial, they were bringing fooid supplies in by yellow helicopter from Coltishall,there we were on the phone to our Sgt. trying to explain why we couldn't come to work, he was bawling us out as the Swanton Morley SWO took the phone from us and bawled our Sgt. out, oh it was worth it