Question: In this episode Brian addresses Den Perry as Dennis, but in another episode in series 2 he calls him Denzel, I'm sure as they are rivals that they would know each other enough to get each other's name right, so why did Brian call him two different names?
Chosen answer: He doesn't have a longer name eg. Dennis or Denzel it's simply Den. Brian simply says this to make Den annoyed by giving him a long name. Another theory is Brian is so stupid that he just doesn't know Mr. Perry's name or is unsure of it but I'm sure it's the first one.
Answer: Yes it is PK - the characters he plays are Brian, Max, Keith Lard and indeed the voice of the radio. you can hear him on the radio a few times throughout the series.