British Airways A380 G-XLEI operating BA287 London Heathrow – San Francisco operated via Vancouver this afternoon due to aircraft defects. The aircraft initially climbed to 38,000 ft but a technical issue required it to descent to 30,000 ft two hours into the flight and the increased fuel burn required the diversion. However due to the issue the flight was terminated at Vancouver and BA286 San Francisco – London Heathrow was cancelled.