As I said, apparently no restaurants in L.A. use MSG, as far as I've discovered, but I'm not sure about elsewhere. I've never been to China but I suspect you would find MSG used in restaurants there. Here in L.A. my Asian markets sell MSG as a spice, often in containers so huge I can't believe my eyes.
I don't know what you'd find in England but you might want to check just to be sure, and if they're using it I'm pretty sure they'd be happy to leave it out when cooking your order.
MSG is a flavor enhancer so it can easily be left out and the only effect might be that the flavors might be more subdued.