I think you need to take the bumper off - have a look at all the connections/terminals in the connector to see if there is corrosion - and spray with contact cleaner - with all 4 sensors silent(not ticking) i would concentrate on the connection between the sensor loom and the parking ECU loom - check all the connections for corrosion / chafing of any kind . 
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She came off the Longbridge Line on 20-05-2003
The Silver Machine was the 13th of 160 Rover 75's to come off the production line that day and is the 100th of 527 Starlight Silver Rover 75 2.5 V6 Connoisseur SE Auto saloons listed in the build records produced world wide.
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