A photo snapped earlier this evening showing the storm clouds rolling in. The colours of the sky/clouds are pretty accurate.
However I did discover one slight flaw in the jacket - the bit of the collar where the hood comes out leaves a little lip on the outside, which tended to catch water and fill up a little, which allowed it to seep inside the jacket around the neck seam. Not enough got in that my clothes underneath got wet at all, I just need to remember to fold that bit down when it's raining hard to stop any water accumulating there. The hood kept my hair and face absolutely dry though, so hurrah! a great success!