Well I don't care what anyone says, I'm loving this series and so are many others looking at the viewing figures.
As for Chris P's in jokes, his T-shirts refer to sci-fi films and the back of his cards refer to some of the greatest indie albums of all time (Psycho Candy- The Jesus and Mary Chain, The Stone Roses - The Stone Roses). I can only remember his Nostromo T-shirt at the moment (Nostromo was the name of the space ship in Alien) but if anybody wants any others explained, let me know, I'm an uber-geek