I am considering flying TXL-LHR-MIA on BA 991/209 Nov 2011. I am OW sapphire and flying in F for the LHR-MIA leg. This proposed itn will allow me only 85 minutes to connect in T5. Is this enough time?

I have checked on the LHR web site and they claim 60 minutes is enough. However, I have flown LHR (albeit never this route and never BA to BA) enough to know that it can be bearish at best, for any connection.

I am seeking the sage advice of those who have first hand experience with this T5 to T5 connection or equiv.

Will I need to reclear security? If so how bad is it?

Will the F class provide me access to a reliable fast track line that will make the 85 minute connection time a moot point?

Any chance, that in the very best of conditions, I would have enough time to experience the Concord room?