Birds of a Feather - Season 11 Episode 2 -

Whilst conducting market research Dorien gives the family an IQ test and Sharon amazes the others with her extremely high IQ. Travis uses her in a school experiment, much to her annoyance, whilst Dorien also exploits her by persuading her to go for a job with MI5, as Dorien wants information for a spy novel she is planning. Tracey, however, is more concerned about Garth, who feels useless and unhappy now that Marcie has returned to Australia.