From a 2009 FAA "Information to Operators":
Recommended Action: Air Carriers who operate Airbus single isle [sic] A319-132 and Bombardier CL-600-2B19 model airplanes are recommended to develop a training program for maintenance personnel and flightcrews on inspection procedures to verify that the engine-fan’s cowl to be latched. It is also recommended to revise their procedures to require maintenance personnel to inform flightcrews when engine-fan cowls have been opened before flight.
It's not clear why the A319-132 is specifically nominated rather than all the IAE-engined single-aisle models (the BA aircraft is an A319-131).
The NTSB were less specific when they made a number of Safety Recommendations in 2008, citing 15 fan cowl separation events since 1992 across the Airbus SA family.