I can confirm the previous posters' experience, in that club was less than 1/2 full on the DFW-LGW route. My wife and I had an entire row (center section) to ourselves, and that is after we moved from another row so we wouldn't bother one of the fellows in an aisle seat. I am sure there will be plenty of seats together.

I can also confirm that the center two seats is what you want if travelling together. The A/B seats don't really allow for comfortable conversation, food or drink sharing, etc.

Enjoy your trip!