I was working on shoreham power station near brighton ,uk . i was an avid follower of the then-flying vulcan bomber xh558 . i had a tracker app on my mobile phone that roughly showed the plane's whereabouts . that particular day and time it was flying between airshows on the south coast area . as i was aware that the vulcan would be flying over or nearby i positioned myself at the top of an outdoor single flight of stairs on a two storey temporary building where i thought i might get a decent view of the plane and i waited with my iphone 6 ready to record . i was not disappointed as shortly after the vulcan flew over the power station . the second it came into view i began to record it . it more or less flew straight over my head . i stopped recording after it went out of my view because the building behind me was in the way . a small tracker plane was flying nearby the vulcan to my left . later on , after work , i sat down and watched the video . where i had stopped it there was a black spec . i was annoyed as i thought i had captured a bee or something and it spoiled my video . i made my mind up to crop the video later on to remove the 'bee' . i zoomed in to look at it and discovered that it wasn't a bee. no legs or wings and if you look closely right at the end of the video you can see the object flying along at great speed . it appears to be a saucer type object with a dome shape on top as the zoomed in stills show . i did not see this object fly over when i watching the vulcan . i honestly think i would not have seen it with the speed it was traveling at.