Hi Sue,
Sorry about the confusion - we have changed the airline from British Airways to Aegean Airlines for 2016 too.
The provisional flight times are as follows:
Departing from Heathrow at 12.15hrs and arriving in Athens at 17.50hrs
Departing from Athens at 13.30hrs and arriving at Heathrow at 15.30hrs
I hope this helps.
Kindest regards,
Monty