Here we have a lovley screen used and matched door sign from the David Tennant story "Impossible Planet", this sign can clearly be seen when the Doctor and rose walk through the door.

As can be seen in the attached screen grab all the marks match up perfectly confirming this was the one used on screen. most of these signs were destroyed after filming making this a rare find.

I run the website www.doctorwhoprops.com and guarantee for life that this is a screen used sign from "Impossible Planet"