IN the last few weeks, there have been gang murders in at least three parts where I have lived, and knew well, and felt fairly safe in - Walthamstow, Ilford and Leyton. And a few months ago, an innocent Polish woman was shot down as she found herself in the middle of a shoot-out between gangs, a couple of miles down the road from here. Last Monday, hundreds of kids charged at the police at the end of the Notting Hill, apparently bent on breaking and smashing everything in their path. There seems to be no end to it.