British Airways Boeing 777-236ER G-YMML operated BA240 Sao Paulo – London Heathrow (depart Sao Paulo 1st April) operated via Lisbon this morning in a planned diversion due to an ill flight crew member being unable to fly. The flight operated with a two man flight crew Sao Paulo – Lisbon with a replacement crew having positioned to Lisbon to operate the Lisbon – London Heathrow sector.