Abstract: Disclosed is a method of transmitting customised program data from a program source (301) to a receiver (304). The method comprises the steps of multicasting data signals from one or more program sources via different transmission channels (305a-d) of a communications network, where the data signals comprise respective sequences of program sections; transmitting a first control signal from a control means (312) to a selecting means (302), the first control signal being indicative of a customised sequence of program sections; in response to the first control signal causing the receiver by the selecting means to receive program sections from selected ones of the first and second transmission channels in a predetermined order corresponding to the customised sequence of program sections.