My 2008 (Bottle Green) Langster came with a flip-flop hub. I can't remember if it had a sprocket on the fixed side when I bought it, but I fitted a Miche sprocket carrier, sprocket and lock-ring for about £15 and they've served me well. I've never thought about fitting mudguards because they're the work of the devil.
I'd intended to use it only for my dead-flat commute at the time, but enjoyed it so much that it became my bike of choice for any ride under 100 miles. Definitely one of my better purchases.