Originally Posted by gormless

IAD is my home airport (and work, given that's right next to the airport).

I've never been able to get into the BA lounge on anything but a BA flight. Their rationale is that the capacity is just too limited. Consider the space, then think about an A380 full of status passengers.
That being said, my last F trip had only two tables occupied in the "First Dining" area. You would think that GGL passengers wouldn't overwhelm, but I'll bet that IAD-LHR is pretty status heavy.