I don't think the MIO Alpha is available in the UK yet.
The other strapless monitors usually require you to touch the screen with your fingertip for a couple of seconds. They don't show your heart rate for the rest of the time. No use when cycling and a bit awkward when running. You won't get any of these with GPS as they are usually watches under £30.
You can buy the Forerunner without a chest strap, but thats only for people who already have one, won't operate otherwise. Quite often when you see one cheap this is the reason why.
Edited: 17/03/2013 at 08:29