By the way, Froute Man some time ago posted a site that has a collection of the Marabout Junior, there, there is a model of a Vedette Rapide, a Vosper Air Sea Rescue. But I can't read the "longueure" 20m???
http://ggmc.free.fr/maquette/index_2.html
the Vospers were 68' about 20.7 m. Different marks were produced between 1949 to 1971 of the Rescue and Towing Launches. Non have the serial 2135.
RAF Boats
Could this be the same?
ps: I am telling you Froute, you are an asset!