Do you go shopping much?
I'm a terrible shopper. I'd rather we all went naked.
What would be your ideal shopping world?
A pool system where everyone swapped things.
Is there something you like spending money on?
I'll buy just about anything if it's food. I don't need my house to be full of things. A fool and her money are easily parted. I spent two years hankering over a Louis Vuitton bag, and when I finally went to the shop, I just couldn't do it.
Have you ever splurged?
My new house in Holland Park is probably pretty extravagant.
What is in your weekly shop?
Loads of milk, fruit and vegetables. Immense chocolatey cakes from Patisserie Valerie. Olives with anchovies and chorizo from a Spanish supermarket called Garcia's on Portobello Market in Notting Hill. It brings back fond memories of when I was an au pair over there.
Do you ever go shopping with your kids?
Oh, disaster. They crawl under the dressing-room cubicles into other people's and put sticky hands all over the clothes.
What is the last thing you bought?
Two bottles of red wine and sugar and milk from the corner shop. I've got builders in at the moment, so lots of tea.
What can't you get through the week without?
Wine - it used to be cigarettes but I've just given up. I love to have a glass of wine when I'm cooking.
• Cerys Matthews is fronting Sky Learning and the WI's campaign W-Icon. sky.com/w-icon