reverse lights on my 820 vitesse

My reverse lights have stopped working fitted a new switch still no joy, the switch is permanently closed and open contacts when in reverse is this correct and there doesn't seem to be any power to either wire on the loom wires !.

Im not sure which fuse it is but presume it is ok as everything else is working on the car can someone shed a light at all who has had the same problem thanks for any help you can give

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