Most Bus Lanes in London have only a set time where you're not allowed to drive in them, they're clearly marked just before the bus lane.
99% of drivers seem to neglect this fact and NEVER drive in them when they're allowed to. It's like you're all absolute pig thick to release a blue street sign that says you can drive here but no one ever does.
It's quite scary though. If you miss such an obvious thing, what else are you not paying attention to on the roads?
Open your eyes you blind idiots and observe street signs.