I have had occasion to use the National Express coach service for getting to and from Heathrow airport for my recent holiday to Hawaii. I would recommend that anyone using this service build in plenty of time in both outward and return schedules, allowing for any delays en route to your departure airport and flight delays on your return. This might seem to be stating the obvious but on this occasion my outbound coach, due to arrive at Birmingham airport at 03.20hrs, did not arrive until 04.15hrs. Consequently, I arrived at Heathrow 1hr later than planned at 06.30hrs although still in plenty of time for check-in at 07.25hrs. My point is that whilst people may expect motorway problems etc to delay their journey en route, they might reasonably expect National Express to stick to their schedule at the beginning of the journey. Birmingham airport, being only a few miles from the coach station in Birmingham city centre, was 2nd stop on the journey to LHR. When the coach did finally arrive, no reason or apology for the delay was given so I still don't know why the coach failed to arrive on time at BHX. On a more positive note, the return journey was punctual with no problems whatsoever.