This is what I use, I bought it from the place in the link
Sima Mini Video Prop Chest Support SVP3 - B&H Photo Video but they were available in the UK you will just have to search around. You mount the camera and put the main strap around your neck, then just hold the top part in to your chest with a bungie. They have a QR plate and are adjustable for tilt so with a bit of fiddling you can make them work a treat, I used to position mine so that the lens just sat ontop of my jacket zip when 3/4 the way up and it gives it a bit more stability. Another tip is to tape some foam of cotton wool over the mike to lesson the wind noise.