It was a businessman who drew my attention to this "Economy" one way fare and his comment was that there is no possibility whatsoever that anyone in his (reasonably big) organisation would be allowed to take up bmi's 6.45am offer at those prices and neither would I.
If the 6.45 departure is to work fares will have to drop and if they don't bmi will lose passengers. No person in there right mind would pay that for such a short flight to LHR.