Garmin Forerunner 405
"Many GPS watches look like props from Star Trek but the Forerunner 405 is a discreet, all-in-one package," Kerry says. "It uses a scroll-and-tap, iPod-style bezel and measures time, speed, distance, heart rate, calories burned, elevation… the list goes on. It stores up to 1,000 laps in the memory and you can wirelessly transfer data to your PC. In short - it's worth the investment."
How much £229 (excl heart monitor)