Lyric discussion by The_Egopunk 

Cover art for Waiting For The Beat To Kick In lyrics by Dan Le Sac vs. Scroobius Pip

I think you're both right... The way the song is laid out, the use of the name Mr. Pip is too much of a coincidence to not be intended as a refrence. I too am stumped as to the identity of Billy Brown. Maybe if we put it too Scroob in a question, he could shed some light on the subject.