http://www.tiso.com/shop/clothing/peter-storm/mens-packable-waterproof-jacket/ (http://www.tiso.com/shop/clothing/peter-storm/mens-packable-waterproof-jacket/)
Been wearing one of these in all weathers the past month or so and can confirm that they're waterproof and windproof. Slightly breathable but I wouldn't like to run a marathon in one. There's zip up and smock versions.
Would be perfect for sticking in a pocket or fishing waistcoat during the delightful Scottish summer.
Paul
Good shout Paul I have been looking for something like this for a while now.
Tight Lines