two guest for a ggl in ba f would certainly be correct for the ccr.
i think one guest for a ggl at mia for the lounge should be fine. in terms of concorde dining that should be ok too, although it does say guest should be same flight
https://www.britishairways.com/conte...3a39%3a02.107z
Gold Guest List members travelling on British Airways flights in any cabin can enjoy our First Dining, Concorde Dining and ‘The Bar’ facilities
with 1 guest.*
Our First or Concorde Dining is available at:
- Boston (BOS)
- Newark (EWR)
- Washington Dulles (IAD)
- Johannesburg (JNB)
- Chicago O’Hare (ORD)
- San Francisco (SFO)
And ‘The Bars’ will be available at:
- Dubai (DXB)
- Singapore (SIN)
When travelling from London Heathrow Terminal 3, you can visit the Concorde Dining lounge before you fly.
*Accompanying guest must be travelling on the same British Airways flight with the eligible Gold Guest List member and access may be subject to capacity on the day. Gold Guest List members may invite two guests when travelling in First only. The proposition is limited to British Airways flights only. For other
oneworld carriers, standard access policy applies.