I am flying from Bergen Norway via London Heathrow to Singapore with British Airways.
I have an 8 hour transit in London Heathrow Terminal 5 and I need to get something from a shop that is located only in Terminal 1, departure transit area.
Can someone advice if there is any internal train or shuttle service which transit passengers can utilise to move between the departure transit area between all 5 Terminals?
Or do we need to go through immigration to exit and take Heathrow Express to get to another Terminal within Heathrow? If yes, does this mean we will have to carry our hand carry luggages with us to go through immigration since our check-in luggage will be already tagged and bound for final destination?
Appreciate all helpful advice here.