[MattW]

MRT's "gap" in the market was cloning - i.e being able to have multiple transponders of the same number. In reality this is all they do.

They either clone a racers own transponder and provide them with multiple transponders of the same number (this isn't just a UK thing, many of the worlds top drivers use the PTX for this reason) - or - they clone the AMB transponders that they own, and sell them to people that don't have one already.