not wishing to ask dumb questions but ...
If this is 39nm in each direction with a land away, does that count? Or does each sector have to be > 50nm ?
Also ... does this have to be in a straight line, or is there "tolerance" for going around obstacles such as the LTN, LGW and London Heathrow/City zones?
For example, if I plot EGLD -> EGTH it is roughly 30 miles direct, but 55 miles going through the EGTC overhead ... (but then I guess if the answer to the first question is "no it is the total distance flown in the day, not each sector that has to be over 50nm" then this is a mute point (at least for me)
Jon