grobace
Have to agree to disagree about the Wattisham 9Ls in 82.
As to SWIFT, I spoke to some of the "boffins"at STCAAME in the early 80s, it certainly was not something that was invented and rushed into service, Barnes Wallis style.
Also, as I'm sure you know, it would not turn a G into an L; it was something else entirely.
(Could SWIFT even be fitted to the G? From fading memory I recall the SWIFT hardware was installed where the coolant bottle went on the American 9L's )
BEagle -You described SEAM pretty much as I remember it.