I initially thought that the two Rigid Inflatable Boats (RIBs) seen in this image were in some way associated with the Williams Shipping Company that has its Head Office in the Port of Southampton. However after a limited search of the Internet I am now convinced that both Ribs are in fact built by Williams Ribs in Oxfordshire and were probably being tested or demonstrated for potential or actual buyers. Both craft are described as yacht tenders, Jet Tenders or Jet Ribs.
I captured the image from the deck of the Red Funnel ferry Red Falcon in March 2018 when both Ribs were motoring in Southampton Water Southampton off the village of Dibden Purlieu.