I walked slowly up and down the aisles, looking for sun-wear items. It wasn't the right time of year for sunglasses and sun hats, but I was sure they'd have a few knick-knacks lying around somewhere.

Next to a row of baby-care products, I found them several bottles of suntan lotion, standing forlornly on a battered old shelf. The choice wasn't great, but they'd do. I quickly read the labels, looking for the strongest sun block I could find. Factor ten … twelve … fifteen. I chose the bottle with the highest number (it was for fair-skinned babies, but I wouldn't tell Mr Crepsley that!), then stood uncertainly with it in my hand, wondering what to do next.

I wasn't an experienced shoplifter. I'd stolen a few sweets with friends when I was very young, and once swiped a load of golf balls with a cousin of mine, but I'd never enjoyed it and hadn't taken it any further. I was sure my face would give me away if I just pocketed the bottle and tried walking straight out of the shop.

I thought about it for a few seconds, then slyly slipped the bottle inside the waist of my trousers, draped the hem of my shirt over it, grabbed another bottle, turned and marched up to the counter.

"Excuse me," I said to the female assistant as she was serving one of the other customers, "but do you have any Sun Undone lotion?" I'd made the name up, and hoped there wasn't a real brand by that name available.

"Only what's on the shelves," the woman snapped irritably.

"Oh," I smiled. "That's OK. Thanks. I'll put this back."

I was turning when the young, long-haired man said, "Hey! Hold on!" Stomach sinking, I looked back questioningly, getting ready to run. "It wasn't Sunnydun you wanted, was it?" he asked. "We've got a crate of those somewhere in the back. I could get a bottle if you"

"No," I interrupted, relaxing. "It was Sun Undone. My mum won't use anything else."