Have never checked, just assumed it would be at correct pressure!!
It's an easy one to forget.
I has a puncture on my old mk5. Once I put the space saver on that was under inflated, it lasted all of about 3 miles before it ripped itself to bits. Because the tyre is so thin it's imperative that it's at the correct pressure.
I then had to fight with the RAC because they said it was my fault for not maintaining a spare wheel/tyre... They tried to charge me the best part of £200 to get me home.
Rich