
Originally Posted by
Katys Grandad
I would strongly advise against using either the HEX or the Underground connections in these circumstances. Both would require going land-side so you would then be required to endure the whole security process all over again at T3.
The best and most favoured route is to disembark from your domestic flight and look out for the clear signs to Flight Connections and follow the route to the airside buses to the other terminals. There is a dedicated bus from T5 to T3. It can get busy and IME there is often a queue for the bus so you might not catch the first one although I have never missed my connection. You will have to go through the hand luggage scanner again when you get to T3 but it's usually no problem. Obviously, the routine is the same in reverse on your return. Your bags will be checked through in both directions.
One note of caution - BA's gates in T3 can be quite a walk from the terminal security entrance and the main shopping/restaurants so I would advise leaving plenty of time to walk through.
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