Of late, my flights to London Heathrow have been from this end (C130)of concourse C. I've found this to be the best place to eat at this end of the concourse. I went for a table, as I don't like sitting at a bar when traveling and didn't fancy juggling on high chairs.
The waiter was attentive and couldn't have been better. I ordered a filet that was reasonably priced and superbly cooked. I washed my meal down with Brooklyn Ale, which was a good choice for me.
If you're a wine buff, you'll enjoy the selection! Le Grand Comptoir is a good place to eat and drink while waiting for your flight. Don't forget to ask for military discounts if your a service member or is ambled veteran.