Martin Underwood wrote:
Where that's not possible, the next best thing is for cyclists to keep
left - except when they want to turn right at a traffic lights

Maybe on a flat road - but Kensington, Fulham and Wandswth are full of
holes down the left of the road. It's not really safe to cycle on the
left then swerve out when you see a big hole - far safer to stay away
from the kerb a bit.