Following on from my post yesterday, according to
BA Source;
British Airways A321 G-MEDJ BA163 Heathrow Technical Return.
February 15, 2014
British Airways A321 G-MEDJ operating last night’s delayed BA163 London Heathrow – Tel Aviv reached Dunkirk in the early hours of this morning whilst still at 12,000 ft, circled to troubleshoot a technical issue and then returned to London Heathrow. The flight and the return BA162 were subsequently cancelled.
Perhaps a pressurisation problem?