
I use the same jacket as when I'm out on my bike - an Altura Nevis. It's light, packs small, allows movement and is absolutley 100% waterproof. Wiggle have got it for £39.99 - http://www.wiggle.co.uk/Default.aspx?Main=AreaFrontPage.aspx&cat=cycle&w=0. Also, it's a lot cheaper than the ridiculously over-riced Galvin Green gear.