Steve,
I'd go with what Tony has written here.
He is VERY SLOW. I've just waited 7 weeks for my 45 to drop through the letter box.
IF you feel you MUST do something, it's better NOT to leave negative feedback, it's not warranted. Just initiate a dispute via PayPal which wiil serve to act as a reminder to Paul to pull his finger out and get your 45 posted.
Worked for me.
Good luck, not that you'll need it.
Denbo.