Originally Posted by
crazyarmadillo
https://www.flyertalk.com/forum/brit...lhr-t5-38.html
When you go to t5b and need to get back to the A gates, just walk the nice walkway, -4 as stated above.
Edit to add. Who knows these days which gate you may go from, so the walk may not be required anyway. I've never flown to FCO but would l ove to. Enjoy!
FCO is still departing out of the T5A zoo. Good walk to burn off the J class food though. Also, the level -4 tunnels are a calm oasis and respite. 😁