Originally Posted by
konagirl2
She should be fine. There is a strong and low latitude jet stream at the moment so flight times are really quick this week. Tell her to expect the flight to be delayed taking off so it doesn't arrive in London too early and that she shouldn't worry about that. Landing at T5C, it'll take 5-10 minutes to get off the place, on the terminal transfer and back up to 'UK & Rep. Ireland Flight Connections'. At that time of the morning she should be through connections immigration in no time (passport doesn't matter as she can use e-gates with either) and as long as she gets to the security check 35 minutes before the flight she'll be fine. Get her to download the BA app to see what gate she is leaving from, so she can walk straight there from security if she is worried.
I was going to post the very same thing about the Jetstream. I've made some very fast crossings on 212 in such circumstances. It used to be one of the first to do the TATL crossing and didn't have to hold outside of LHR. Not sure if that's still the case now.