I do not know exactly how many slots bmi have at LHR but it looks to me as if they have 25 Airbus aircraft based there. This is likely to give rise to around 75 departures per day. The last published slot sale deal at LHR involved Qantas which bought slots from Flybe and paid £24 million for two daily arrivals/departures. It is interesting to do the maths of this on bmi. The figure is 75 multiplied by £12 million. On that basis bmi would be worth £900 million.