Details of the other drone incidents referred to by FlightGlobal on the two preceding days, both involving BA aircraft on Biggin arrivals for 27L:
The first was BA A320 G-EUUE operating BA547 (BAW8CF) from Rome (LIRF) over Greenwich at 1850Z on Saturday July 16th, Airprox Category: A
BA547 Flightpath from Heathrow WebTrak
UK Airprox Board Report 2016142
The second was BA A319 G-EUPS operating BA531 (BAW531) from Split (LDSP) over Isleworth at 1736Z on Sunday July 17th, Airprox Category: B ("Safety not assured: aircraft proximity in which the safety of the aircraft may have been compromised")
BA531 Flightpath from Heathrow WebTrak
UK Airprox Board Report 2016137