The fault turned out to be the shuttle valve switches which are located in the base of the modulator. There are two switches which send a varying voltage back to the ECU via a Yellow and green wire. This should have 3.8 volts on it when the switches are working correctly. Mine had gone open circuit.
This part is available from Land Rover - part number SWO 500030. Its around £44 + VAT and our local supplier keeps it in stock!
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