More often than not, cyclists in London have to share the side of the road with bus lanes. Only bus drivers don’t see it this way. Their cabs are on the right, so they can’t really see anything on their left-hand side anyway. Plus they’re a lot bigger than you and the roads say “Bus Lane” on them, so surely they get priority?
Combine this attitude with the fact that long vehicles turning left are the highest cause of cycling deaths and you can see why cyclists don’t like busses much. Extra busses to carry passengers stranded by the tube strike just means extra danger.