Ok, cost of living's probably not as expensive in that area as it will be in the next few years, what with the regeneration project that's currently happening. However, it's still North of the river, and quite close to it too, which may push prices up. Crime's on a decline from last year too, it seems, but it's still a little high compared to other areas of London.
Videogame stores are mainly dominated by the franchise GAME. Their prices are a little higher than Amazon and they were in a spot of bother financially a couple of years ago. Another high street option to shop for games/consoles (especially second-hand games) is CEX. Their stock varies from store-to-store but they've had a good supply every time I've gone into one. Amazon seems to corner the market on prices, though.