Here are my instincts on how each member of the Cornley Drama Society would do in the kitchen! I've arranged them in roughly descending order of how good at cooking I think they are.
Robert, Annie: good at cooking, enjoy it, tend to work on instinct rather than following recipes.
Jonathan: good at cooking, fairly neutral on it, generally follows recipes but capable of deviating if he thinks something else would work better.
Chris: can follow recipes, doesn't particularly enjoy it, tends to favour anything that's quick and easy to prepare so he can focus on other things.
Vanessa: can follow recipes, but finds cooking stressful; would never consider making alterations to a recipe; tends to stick to a handful of tried-and-true dishes she's made many times before and knows she's capable of.
Max: wildcard, either a surprisingly solid cook or can't cook to save his life.
Sandra: no idea how to cook, tends to order in or cajole others into cooking for her.
Trevor: lives on crisps.
Dennis: banned from so much as looking at an oven.