In the cafeteria, Ben and Katie introduce some simple ideas about ratio. Unfortunately, cakes and biscuits are used to illustrate the ideas, and Ben can’t resist scoffing a cake and changing the proportions.

01.05—04.08

Chef Neil Nugent is working on some samples for a major food retailer. He uses ratios in his recipes. Ben and Katie are called in to test three different versions of Neil’s new dip and decide which has the best proportion of garlic. A recipe to serve four is given, and Ben describes how to adjust the recipe to cater for different numbers of people.

04.08—06.01

Neil’s latest korma sauce will have to be scaled up for factory production, so he has to know exactly how much of each ingredient he has used to make his batch of three jars. Katie shows us the main ingredients for this quantity of sauce and asks how we could calculate the amounts needed to produce 4,000 jars. Having sampled the results, Ben and Katie are keen to keep a jar each, but Katie will need to visit the factory to find out how Neil’s recipe is adapted for a production run.

06.01—07.25

At the factory, Katie gets to wear her hairnet and meet with Amy Leong, whose job it is to adapt recipes for full-scale factory production. The korma recipe is scaled up, and we see how to do the calculations.

07.25—10.44

Ben visits the offices of the charity Comic Relief to find out more about sharing in a given ratio. Tony Robinson explains how the total amount raised is shared between projects in the UK and Africa. Ben does some calculations to see what will happen to the millions donated in the last, record-breaking appeal.

10.44—13.27

In ‘Tick or Trash’, Ben and Katie tackle a sharing problem, based on projects supported by Comic Relief. Katie explains her mistake and emphasises the importance of checking that an answer is sensible.

13.27—end

Ben offers his services to Comic Relief — but Tony is not keen for him to be ‘exposed’!