In store only. The exact model is hrm1 which is £16.33 at amazon. http://www.amazon.co.uk/Kinetik-Medical-Heart-Chest-Transmitter/dp/B003SX0UX8.
More information on the company at http://kinetikmedical.com/lifestyle/health-and-fitness.
I bought one for my oh, just checked the content it seems ok quality (very similar to the York one I own). I haven't tried it yet as I am planning to save for valentines, but I will try to test as soon as I can to make sure it works ok.
* Average and maximum heart rate monitored
* Stopwatch and alarm
* Shows current heart rate
* Batteries included
The Kinetik Medical Heart Rate Monitor is designed to help you keep a check on your heart rate during physical activities.An inactive lifestyle is a top risk factor for heart disease. Taking regular exercise and increasing your heart rate above its resting level may help to lower blood pressure, improve your circulation and strengthen your heart.
• Heart rate monitor watch
• Chest transmitter
• 2 CR2032 batteries
• Instruction book