As TC says pressurisation in a cold system indicates HGF - so give her a 10/15 minute thrash at motorway speeds - leave her overnight then open the expansion tank cap - if you get a clear audible hiss of escaping gas it points to HGF as exhaust gas is in the coolant system - also smell the expansion tank to see if there are are exhaust fumes present.
Finally have you lost any coolant at all ?
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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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