Ok, I found the Tyre Pressure lable and it is on the passenger door as in the previous image posted by NicDog.
However, the tyre size is different to those on my DS 4, I thought this is strange but my granddaughter came to see us and she has the Citreon DS 3 on a 62 plate and she says the label on her car with the tyre pressures on also has a different tyre size, strange.
My car is only 3 months old so I can't see the dealer I bought it from, they were using it as a demo car, having changed the tyres and wheels.