 Robbie warns Del that lying to his GP has meant that diagnosing Del's condition (IBS) has taken far longer than it should, and that only because Robbie knows Del (and begrudgingly admires him) has Del's condition been successfully identified.Jumbo Mills (Nick Stringer in "Who Wants to Be a Millionaire" and Lee Long in "Rock & Chips") was Del's old school friend and business partner (they ran a jellied eels stall together) who emigrated to Australia during the 1960s.Jumbo returned to Peckham in the episode "Who Wants to Be a Millionaire", and offered Del the chance to restore their old partnership by helping him run his new used car business back in Australia, only for Del to refuse the offer due to Rodney being unable to go because of his drug conviction.