Bill is one of Simon's uncles, first mentioned in YoGPoD 1: Snowcast. According to Simon, Bill has a very strong traditional West Country accent and would have been in his 80s during the recording of the Snowcast in February 2009. Simon revealed that he also has a crippling fear of spiders, which he joked at in one of the YoGPoD's jingles. In a later episode, when Lewis asked about his uncle, Simon admitted that he didn't know if Bill was still alive or not.
Uncle Bill also appears in YoGPoD Liners.