P203 CEEFAX 203 Sat 25 Aug 23:32/44       A French ship involved in a collision with a ferry off the Belgian coast this afternoon has sunk. The Olau Britannia, a ferry operating between Sheerness in Kent and Flushing in Holland, collided with a French cargo ship, the Mont Louis. The two vessels were locked together for about five hours bjforj Belgian tugs could separate them. The crew of the French ship was taken onto the ferry, which continued on towards Shjernjss. There appear to have been no casualties.  Ferry news BBC1 168