So having done my rain dance I was granted my wish. this morning it poured down all the way into work.
I have to say the jacket was great! My top half was bone dry and no water soaked through. the stuff in my pocket also stayed dry. Its also really warm, maybe too warm. Not so cold tonight and I was sweaty when i got home. However it's not 'breathable' as such.
All in all, for £25 an absolute bargain. I am glad I took the risk.