I believe that the 4 blow jobs version came about in the last year of the Shackleton (1990-91) when there were 2 x 8 Sqns: 8 Sqn North at Lossie with the Shackleton and 8 Sqn South at Waddington with the work-up to the E-3D takeover.
Up 'til then the 2 blow jobs was to signify that all the other aircraft at Lossie were twin jets (Buccs and Jag OC). It was certainly 2 blow jobs during the early 80s.
W
PS. I did have a google to see if there were any images on the interweb, but couldn't find any.........had to look for the whole phrase though.
