I have flown from Malaga to Gatwick with BA on a number of times. Mostly the evening flights back to LGW. On most occasions the departure has been between 1-2 hours late.
Recently, the BBC (red button now defunct) one could access flight arrivals to most UK airports. BA arrival times to LGW from Malaga were appalling. Compared to the Orange one. It's a 50/50 situation, sitting like a sardine in a can or more leg room (319)