2022 will be a year like no others to spend USD in the UK, that alone is enough to give some confidence. Interesting parallel with BMI's MAN-IAD, the way to think about this, is that MAN-IAD vs. IAD-EDI I think. Point of sale was predominantly UK in the first and seems to be US skewed in the latter. Which may also explain why the Thomas Cook US routes are still a gap at MAN, as UK POS dominated and that's relatively weaker now.
It's funny how we get fixated with long haul and the big jets, STN,MAN, LGW,GLA thread all similar sentiments