The walk to Terminal 2B from the main Terminal 2 departure area is approximately 10 minutes (including 2 fairly tall elevators/escalators), and other than if your flight is departing from that terminal there is really no reason to make that walk – it’s smaller than the main terminal, and although there are a few shops in 2B, they are simply smaller versions of the same shops that are already in the main Terminal 2 area.
Unlike many airports, gates at Heathrow generally aren’t assigned (or at least, advertised) until around 45-90 minutes before departure. Most likely what they are attempting to avoid with the signage you’ve mentioned is having people presume their flight will depart from Terminal 2B and walk over there, only to find it’s actually Terminal 2A and have to walk all the way back.
(If I recall correctly, there are moving walkways in the tunnel between terminals, but they only go in the direction 2A->2B, so the walk back takes even longer!)
There is nothing to stop you going over to 2B well before your flight (and personally I normally do exactly that in order to access the United Airlines lounge in 2B) other than the fact that if your flight ends up departing from 2A you will need to walk all the way back.
Credit:stackoverflow.com‘
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