Quoted from Lovef2k:I found this guy when doing an Ebay search for decals. Not sure of the quality as I have not ordered yet but it looks promising.
http://www.retrorefurbs.com/shop/doctor-who-pinball-cabinet-decals/
I got decals from them and while I haven't installed them yet they look very nice and the price was great. They are very shiny and thick and the colors were accurate to my eye.