The Prof builds a balloon to map out a treacle-exporting route, with Bert the Boggart in the pilot's seat.

Glynn Mills
Tapper Knowle (voice) / Ike Mitton (voice) / Narrator (voice)

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Alec Bregonzi
Prof. Baines-Pilling (voice) / Nellie Newchurch (voice)

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Brian Trueman
Charlie (voice) / Furness (voice)

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Jim Norton
Brendan Robinson (voice) / Silas Mitton (voice) / Digger (voice)

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Jim McManus
Bill Wizzle (voice) / Nicko Pendle (voice)

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Caroline Bernstein
Leyland Lil (voice) / Rosie Mitton (voice) / Bert (voice)

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