A method of making a diluted polysiloxane containing polymer comprising the steps of:-- i) Preparing a polysiloxane containing polymer by the polycondensation of siloxane containing monomers and/or oligomers which comprise condensable groups in the presence of an organopolysiloxane and/or an organic based diluent material, a suitable catalyst and optionally an end-blocking agent; and ii) Where required quenching the polymerisation process;wherein the diluent material is substantially retained within the resulting diluted organopolysiloxane.