Ohhh booo hoo dry those tears boys.
T5B is part of T5, it's what we call a "Satellite". The reason for the long walk is to make sure you walk past all the shops before you get to the plane and as for flight connestions signs, I assure you there are f***ing plenty mate, perhaps you should have asked the guide dog.
Dear God if it's soooo bad there are four other terminals and many other airports. I found it rather uneventful ( dull even ) when I was through last week. All new, shiny, ( almost complete it IS Britain after all ) and arrivals is a pice of cake.
The bussing is not unknown throughout Europe, and will remain at LHR even after T5C comes on line as there is not enough space to fit the full BA program on a pier. This is not news and has been known about since Pontious expressed an interest in flying school.