Milltag Rain Jacket
Sticking to the Pro-like all black design for a waterproof is Milltag's really rather excellent looking Rain Jacket.
Made from a 2-layer membrane fabric and cut with enough room for layering on those miserable days, and also includes a waterproof rear-pocket which is often missed out on rain jackets.
Coming in at £90, you can grab one direct from Milltag right now