Everyone inside Upton Park got up in the 38th min to applaud for West Ham's #38 Dylan Tombides - who lost his life. http://t.co/AYxPpxzlUR
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Transport for London teamed up with a host of recognisable voices to encourage Londoners to support the Royal British Legion.
She will be joined by chart acts Rixton and Jess Glynne when she presses the button for the festive illuminations on November 6.