Arriving on the BA206 MIA-LHR (arr 06:40) next week and departing shortly after on the 1386 LHR-MAN (dep 09:50). Has anyone been through UK passport control around this time? Will it be very busy? Hoping not as I would like to have enough time to use the GC lounge to freshen up before my departure to MAN.

Say that customs took maybe 50mins or so and I got through at around 7:40, would I still have enough time to visit the GC North lounge?

Thanks