Kent Moore was asking about connections at Heathrow.
Last summer I flew Toronto-London-Dublin and the
same back. The flights over the Atlantic were Air
Canada, the flights London-Dublin were Aer Lingus.
My luggage went Toronto - Dublin and the same home.
However do not dilly-dally when going from one
Terminal to another. In some instances it is a good
long walk, or bus ride from Terminal to Terminal. Get
to the terminal you leave from as quickly as possible
and then you can relax.