If you want noodles on the run, Wagamama is the place to go. They do that whole functional bench seating thing so it's not a place for romantic dinner.
Wagamama do healthy fast food. And it's cheap too.

Always fresh food...friendly staff...delicious food.

But last time I went there with a friend I ordered a meal that had tofu in it. I could find 1 little piece only! Usually it comes with lots of it!

still a favorite place for a good and quick meal!