I was in my back garden smoking a cigarette when I spotted a glowing light in the sky east of my house moving north silently. the object was yellow/orange triangle shaped light and was constantly glowing dimming glowing dimming. it seemed to be at a very high altitude much higher than any plane I've seen and was moving much faster than a plane I estimate 800mph+. I live not far from London city airport and also Heathrow airport and right above my house planes will start to turn to land for London city airport but always come from due east or due west, I have observed many planes above my house before small aircraft to military jets but nothing like this.
when I first see this object I thought it was a Chinese lantern but then I noticed the light was not flickering.
after I see this object I felt very interested to find out what this was.
I lost sight object when past the rooftop of my house.
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