Aaaaaah, analogue
The core of MFS was actually Mk.10 Autopilot, which in civilian clothes was SEP2.
SEP2 was also standard fit on the Britannia and Comet C Mk 4 in RAF trim, where SFS (Smiths Flight System) was fitted.
The only real difference between Mk.10 and SEP2 (apart from various gearing changes) was the absence of the "Bomb" facility.
SEP1 was, I believe (a little before my time) the RAF Mk. 9 autopilot--which appeared on the Comet C Mk.2. No flight system as was later known, just the Zero Reader......a wondrous binary driven machine.
Smith's at Cheltenham used to have a small museum of their wares--fascinating for those of a technical bent. You could also eye the girls from CLC from the office window.........