Wise words, Pacha, and for that very reason my connection at LHR is 1h55min which should be fine. Do you think I'd be better off avoiding the Flight Connections Centre and going out through immigration and security (I have a British passport, so that's always quick) and across from T2 to T3 then back through immigration / security? I was based in London for many years so never had to use the FCC, but I hear it's a bit of a nightmare...