The building you see in these images, taken in 2015, bears very little resemblance to the one constructed in the mid 1960s.  (You can see an image of the site at that time by following this link to the Botley & North Hinksey website).  In fact the only thing that remains from that time is the cruciform tower with a spire on top.  Even that has changed because originally the four arms were flat sided.  Photographs dating from 1988 show construction underway.  This clearly involved the demolition of the multi-storey car park and the addition of two wings, one on either side of the tower.  What appears to be a lift shaft has been added to the tower above the main entrance, and the flat sided arms of the towers four arms have been adapted with curved facades.