Qype User (.
Yelp
This tiny shop is a bit hard to locate at first as Pratt street is a little walk in the other direction from Camden Market.
Once you have found it, you will love it! Stocks Proper Punk, Oi, Psychobilly, Ska, Nu Punk..... In both LP and CD formats. It also stocks Hard to find band tees, badges, patches (including those elusive large ones for the back patch!), pins, custom clothing, posters, DVDs and as you walk in the wall is covered in adverts for local drummers, singers etc.
If you are into or curious about the punk scene then I would totally recommend this place.