Strange activity in the sky above London

This video was filmed in February 2016 in the sky above London, United Kingdom.

Witness report: We videoed this from our flat in ponders end, Enfield, London, UK.
At first glance you might think this object was a star if you didn’t know what your looking for, but it’s not, which I could see when I videoed with my tablet and was able to zoom in fully then I noticed what it is.
I was taking pics of it before from my mobile zooming then screen shooting then zooming again to see it up close. I showed people and some of them trying to tell me maybe its a helicopter, I told them I never seen a helicopter dismantle itself and reattach itself in mid air before have you? But a lot of people are more stunned at what we have filmed.