Hey everyone. First time posted on UA boards. I am flying IAD to LHR on United at the end of the month in C.

What lounge / lounges does everyone reccomend one use?

Also, can you wander (via walkway or train) between the A and B gates and C and D gates without having to reclear security or pass in to a different security zone?

Thanks for any advice you can give me.

(oh, and I hold *G through AC if that also helps for lounge access)