Sorry if this has been asked and embedded in the thread. I didn't see it.

Traveling JNB to LHR to USA in paid CW with a very long layover. Arriving LHR ~5am Dept LHR ~2pm

If I am fortunate enough to get an AUP on JNB to LHR to F, can I use the Concorde lounge for 8 hours?
If my travel companion stays in CW, Can I guest him into the Concorde Lounge?

Thanks in advance