0528 from London Liverpool Street arrives 0632 at Southend Airport.
Just about OK for those who have already checked in on the web and printed out their boarding card, have no luggage, have no mobility issues (e.g. difficulty walking), prepared to take a bit of a gamble on the train not being too late / cancelled, and would not consider it a disaster if they ended up missing the flight.
For anyone who doesn't meet all those conditions and are coming by train from London, I agree there are issues with an 0715 departure