Andrew, who is just 14-years-old, is believed to have gone missing in imitation of Perrin, one of his TV comedy heroes, who famously faked his own suicide and started a new life.
Nobbs will record a television interview today to appeal for help to find Andrew.
Andrew’s father Kevin Gosden said: “David Nobbs saw one of the articles about Andrew and was kind enough to contact the BBC to offer any help he could.”
The teenager is believed to be in London. His mum, Glenys, is in the capital taking part in television interviews, distributing posters and hunting for Andrew at his known haunts.
Andrew, who is said to be a quiet, self-contained and intelligent youngster, was last seen on Littlemoor Lane, Balby on the morning of Friday September 14.
He is believed to have caught a train to London later that morning.
He withdrew 200 from his bank account, but will not have access to any more money, as his family have frozen his account.
Andrew, who is 5ft 3ins tall and wears glasses, was wearing a black top, black jeans and trainers when he went missing.
Information about his whereabouts to South Yorkshire Police on 0114 220 2020, quoting reference number 17824.