This was the only factory produced dark blue over light blue Duotone.
As far as it is known only dark colours over dark colours were built by MG Rover.
Rover did not produce any Duotones from Cowley, as far as we know.
MG Rover produced one Blue over Silver Duotone for the Motor Show in 2002/2003 and the no more until late 2003/early 2004 when they were offered for sale to the public.
Dave T