The London boys are going a bit geek chic at the moment. Lots of grey cardigans, heavy rimmed glasses and traditional Levi 501s, together with the continuing popularity of Converse trainers.
Big news is the checked shirt. It is available in gingham checks and tartan as well, but I strongly prefer the part-cowboy, part-grunge shirt, as pictured here from Topman.
Also new on the style scene is the v-neck t-shirt for the boys. A deeper v-neck than you are used to wearing makes it an edgier choice.