In uk.transport.london message
ia.com, Wed, 10 Feb 2010 17:08:32, Richard J.
posted:

Mostly middle drive, I think you'll find, often from the rear seat. If
you're referring to which side of the river they drive on, then the
general rule is to keep right, though upstream of Putney Bridge,
depending on the state of the tide, there may be a contraflow lane for
rowers on the inside of bends.

One trusts that those who do so when the tide is particularly high are
familiar with the case of Rumpelhammer v Potts (APH 1930).

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