Bright large white ball of light fell through clouds and pulled up then vanished of IBM headquaters in Portsmouth in the UKI am a taxi driver (obviously sober). We were traveling northwards in Hilsea, Portsmouth (UK) in my taxi - saw a bight white sphere about the same size as the moon which was full at the time to my left (east). I had 3 passengers who were chatting to themselves. The passenger on the rear nearside saw the sphere. It traveled down through the clouds and dropped very quickly downwards in a 70 degrees angle but pulled upwards at about 100 feet but disappeared from view over the motorway bridge toward IBM North Harbour buildings. So not to coerce each other about what we saw, man in back told the other rear passenger what he saw and I told my front passenger what I saw. We then both concluded we saw the same event at the same time. freaked us out. Was far to fast for a helicopter, and the movement was to fierce for a jet or plane when it pulled up. It also could not have been a meteor or asteroid as it pulled up and change direction. Another person I spoke to about this saw a similar event but the light was orange not white.