I can see these attacks exacerbating racial tensions.
Firstly I don't recall the British goverment being overly distressed at the numerous and frequent bomb attacks in Belfast city Centre, but it is easier to be concerned when your home/family might be affected.
Secondly, a point which my brother brought up yesterday. He moved to London with an irish accent and was targeted in school by kids who thought to punish him for being a terrorist. School kids will do exactly the same thing with all asian kids, probably whether muslim or not, so the terrorists are condemning poor little kiddies to a lot of unneccesary bullying.