Who Wants to Be a Millionaire? - S5-E6
Trivia: This episode was actually going to be David Jason's last as he had told the writers that he wanted to go elsewhere to further his career. Just before John Sullivan had finished the script, he changed his mind and said he wanted to stay. The alternative ending was to see Del take up Jumbo's offer and go to Australia and then Rodney and Micky would trade together.
Chosen answer: An apparent long string of illnesses.