2003 Ford Mondeo Estate Parking Sensors Not Working?

Just bought a 2003 mondeo estate ghia.

Has parking sensors but they don't engage when I start reversing. No sound. I'm still waiting for a Haynes manual.
Anybody know where I should start looking in the meantime?

Any know common issues?

Do the reversing lights work?
Are they factory sensors or after-market versions?
Pre-facelift (up to mid 2003) Haynes diagram does not cover the factory reversing sensor

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EDIT
The control box is hidden in the boot behind a trim panel on the nearside.
It is possible the previous owner disconnected it if one of the sensors was faulty.
diagnosis here:
http://fordwiki.co.uk/index.php?title=PDC_Park_Distance_Control

Fred K, reverse lights do work and the package is factory fitted.

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