I saw too. Was also obeserving EGLL departures for BAs . Between 1000-1100 14 went off and between 1230-1400 15 likewise. Saw quite a few different carriers carrying BA fltnos, including Astraeus, Jet2 ,BMIbaby, Transavia, all european flights. Included in the total flights observed were 12 long haul, all with BA a/c