Talented comics including Johnny Vegas, Jenny Eclair, Rhona Cameron, Doon Mackichan and Fred MacAulay revisit locations in Scotland that have inspired their work, including Edinburgh, Musselburgh, St Andrews and Aviemore. Julian Doyle, Production Manager for Monty Python Films, also returns to Doune Castle where he created the medieval world of the Holy Grail on a shoestring. Alan Whicker narrates.

Maureen Lipman returns to her comic roots in Hull, where she first got laughs on the steps of her father's tailor shop. Brothers Simon and Chris Donald visit the Victorian terrace in Newcastle where they gave birth to the anarchic comic Viz, while writer Ian Le Frenais trawls the city's suburbs to reveal the haunts of the Likely Lads. Leigh Francis travels to Leeds to reveal the 'real Avid Merrion'. Alan Whicker narrates.

Radio 1 DJ Chris Moyles returns to the Leeds radio station where he learned his craft. Comedian Mark Thomas harks back to his political roots and reminisces about his early attempts at social activism. Impressionist Jon Culshaw goes in search of his biggest fan and there's a visit to the Working Men's Club where the local extras got more of an eyeful than they anticipated. Alan Whicker narrates.

A selection of comedians retrace their roots in East Anglia and Essex. Former Dad's Army Star Ian Lavender visits the show's locations in Thetford, Arthur Smith goes back to his university days in Norwich and, in Suffolk, Lee Evans' dry cleaner talks about the challenge of keeping the funnyman's suit pristine. Other contributions come from Lee and Herring, Dudley Moore, Lee Evans, Paul Whitehouse and Charlie Higson.

Alan Davies returns to Whitstable, where he made his debut, Steve Pemberton goes back to the Rottingdean shop that inspired The League of Gentlemen, and Iain Lee finds out about Marty Feldman's old fairground job in Margate. Alan Whicker narrates. Last in series.