two sets of three objects red lights,pulsing/flashing.

clear night, no cloud,however they SUDDENLY came into my view?

this was the night of the G.20,so after my first thought of whats that!(they arent on the normal flight path,and indeed a commercial plane airlines passengers/crew approaching Heathrow(think B.A?),at the time would had seen what i did out of their port windows,as the light were close to it)was "mmm maybe helicopters taking summit leaders to destinations?" However one hour later i went and looked again,and the EXACT lights, formation etc i observed earlier were happening AGAIN!?thats alot of helicopters!It was the G.20 night, so i really expect it had something to do with it eh?