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As the series returns for a fourth run, Gregg Wallace wakes up and smells the coffee – literally – as he travels to a huge instant-coffee factory in Derbyshire to see how, among other things, they capture that ‘freshly brewed’ smell as you pierce the jar’s foil lid.

 

Inside the Factory S4 - Coffee

Cherry and Gregg learn about instant coffee

Cherry Healey goes cold turkey while learning about the chemistry of coffee as she gives up caffeine, and Ruth Goodman finds out why coffee is ‘a cup of Joe’

TV Times rating: ****