I hate London five guys. Too much noise, burguer too much cooked and everything more expensive than other places. Go to byron or burguer kitchen if you want a good burguer, for same prize.
Vegetarians don't bother. The veggie sandwich is simply the plainest food I have ever tasted, no flavour whatsoever. Sadly a McDonalds Veggie Burger is tastier than this. Work to do here Five Guys