BEE416 20 mins late departing EGBB last night due to delays 'loading bags from a connecting flight'.
'Connecting flight' with FlyBE? I hadn't thought it was possible but their website does make reference to 'through fare':
means a single ticket for a passenger’s continuous journey that involves connecting transportation on two or more flights, where baggage is checked in at departure and only collected at the ultimate destination.
Perhaps the AFR code-share offers this service.