TUI flight from Agadir to London Gatwick is declaring and emergency.
The flight #BY357 departed Agadir in Morocco at 15:00 WEST.
The Boeing 737-800 was flying 2 hours into the flight when the crew declared an emergency.
Pilots squawked 7700 (general emergency) after flying North of Spain at 22,000 ft
UPDATE 16:05 GMT
The aircraft is turning around back toward Spain or Portugal.
UPDATE 16:19 GMT
Flight #BY357 is diverting to Santiago de Compostela.
UPDATE 16:35 GMT
The Boeing 737-800 (reg. G-TUKO) has landed runway 35.