Well well well, looking at the bmi schedule for the summer it shows the first flight up from LHR, and the last one back down (330/345), as an ER4, which arrives at MME at 0730, departing at 2150......are they planning some more routes from MME operated by regional? I looked at the schedule for May, 2 separate weeks and it was the same....do they know something we don't?
If they are planning some more routes, then it would need to be probably around 3 returns a day to fill one aircraft up, and in that case JER has got to be a probable one. For the other 2, well ABZ and AMS spring to mind as possibilities.