SIGHTING REPORT UFO sighting at BRIXHAM,Devon,UK

At first,(relative to its distance from us)just the size of a tennis ball,perfectly rounded in shape and glowing a very bright "silver" colour,with a slight "pulsating" appearance.

The object stopped extremely high in the sky - MUCH higher than any aircraft - directly above us,just "hovering". After about 45 seconds,the object "swelled" dramatically,to the apparent size of a football,although we could tell it was obviously much larger: the glow became intense,and illuminated the sky around it,like a giant firework "sparkler".
It then grew even bigger,before suddenly zooming ever higher at tremendous speed,into the sky ,following an arc-like trajectory,and disappearing completely from view within a matter of seconds.Its speed appeared to be thousands of MPH.

Four of us witnessed this,ranging in age from 22 to 41. We were travelling in our car,back from Torquay,Devon,UK,to our camping site on a hillside near Brixham. The sky was completely clear,and moonless. The driver pointed out the bright light,and we watched as it did a slow,curving "zigzag" motion across the sky,and,to all intents and purposes,it appeared to be FOLLOWING us! (Although I say 4 of us witnessed this,several other people on the site also saw it!)
Talking next day,we heard that there had indeed been a "UFO" sighting in that area of south west England.
Not one of had been drinking,etc.