you really do need to accept the limitations of Heathrow and hope that the days you want to travel are not affected by snow rain fog sleet high winds or a blocked runways.
My clients do not think that ‘hoping’ is a reasonable strategy for turning up to run their events.
QED use other airports, usually ZRH, FRA, MUC, AMS who have made the right investments.
Still, what does one expect in the UK? Plenty of excuses, litle action.