3 orange-red round objects above House of Parliament, London, EnglandCrossing Westminster Bridge; I noticed three round "balls" above the House of parliament. They moved very fast, away from me, and twirled around each other. They were, at approx 300 ft distance (100 meters), approx 100 ft (30 meters above the house of Parliament. They seemed , at that distance, about the size of a small balloon at arms lenth. They were orange-red, very bright! It lasted for approx. 3 seconds.