Spectacularly useless at pc world.
I agree with the negative comments about pc world in the UK. They've all just been on customer training courses, so if you get within 10 feet of them they'll grimace at you (they think that is smiling).
However, ask them a question and they will either lie, or admit that they do not know. (I have real evidence about the lying, so I'm happy to put it in print). Each store has 1 or 2 people who know about pc's, but whenever I go in they cannot be found.