London Bridge Station
The Tube station has exits at both ends; the most-used end takes you through The Vaults to the mainline station, and the other end brings you out on Borough High Street photo — when you get to this end, take the exit with the steps for Borough Market, [Vinopolis]?, the Market Porter, etc (west side of the street), and the one with the escalator for the George and other stuff on the east side of the street.
The photo on this page shows the Tooley Street entrance/exit, from which the mainline and Tube stations are both accessible. However only the Jubilee Line has a lift from this entrance. If you want lift access to the Northern Line you need to go to the Borough High Street entrance.
When entering the station, the two Borough High Street entrances are the ones to take if you want to get to the Jubilee Line quickly and without visiting all the tunnels of the station.
The bus station is adjacent to the mainline station. Many buses actually stop on the bridge rather than in the bus station.