In any case, my mate got up at 3 am and has at least a fourteen hour day in front of him since he is driving.
I guess the simplest solution would have been for me to pay 50% and effectively receive four hours flying for the price of two. That would then be squeaky clean wouldn't it?
....Of course if we failed to return, how would the court know of the arrangement? But I suppose a file note by me would be sufficient.