Anyhow, there has been a change in the basing plan. Lossie was the original site chosen, as I mentioned before. So something changed at some stage.
The decision to locate 3 Typhoon squadrons at Lossiemouth was the change. With the best will in the world, there is no way you could stuff one or 2 JSF squadrons, plus an OCU in there as well.
Marham must have access to a whole lot of quality training and LFAs that Lossie doesn't.
I don't imagine that LF is in the JSF CONOPs... and I suspect that access to LFAs is fairly low on the list of priorities. Marham has good access to the D323 series for regular training with aircraft from Coningsby and Lakenheath, and can also reach out to the Dutch and Belgian training areas to work with their F-16s (and eventually F-35s).