Hi Sylvie,
So the flight times for both dates are as follows:
Depart from Heathrow airport at 07:25hrs and arrive in Milan Linate Airport at 10:20hrs. On your return, you will depart Milan Linate airport at 16:55hrs and arrive back in Heathrow airport at 18:00hrs.
Please note these flights are only provision and are subject to change.
Kindest regards,
Monty