Here's a couple of answers to similar questions in the past:
"Go to this site: http://www.michelin.co.uk/car/
and choose the tyre selector. You can then choose your car type and model from drop down lists. You then get all information about the correct tyre for that car and also the correct tyre pressures" (from rinkytink)
and
"if you open the driver's door and look on the doorpost (locking side) you should see a sticker which tells you the pressures loaded or unloaded." (gazzawazza)
But then again Mike, suppose the car had been nicked and when found the driver's door was missing, you'd have nothing to open to see the sticker would you? But then again, thinking about it, without a door you couldn't get in to drive it away, so it wouldn't really matter.