Pretty high when you consider who will be the owner of bmir
Why should it be? Lufthansa face many of the same pressures on slots at Frankfurt in particular as BA do at Heathrow. BA certainly didn't make a habit of handing out slots to distant subsidiaries like TAT/Air Liberte, Deutsche BA and others to fly into Heathrow. Similarly, Lufthansa will not want to give up slots for small aircraft at peak times.
Watch instead for operations into the secondary hubs - Leeds/Munich 3 x daily Embraer 145, perhaps.