Darmstadt - Restaurants - International
The Riwwelmaddes is the closest I've come to an English style pub in Germany. They have a good whiskey selection, serve up an excellent Guinness and the menu is varied and very reasonable. The meat on a hot stone is great for the carnivores amongst you.
Every so often they also do an excellent Fish and Chips night. You have to reserve a portion, and the portions aren't huge (by German standards) but it's the real thing.
My only complaint is that they're shut at the weekend.
Check out my review of Riwwelmaddes - I am muddybunny - on Qype