Martin Underwood ) gurgled happily, sounding much like they
were saying :

Cyclists, on the other hand, often overtake cars which are
indicating left. As a car driver, I usually pull close to the kerb as
I approach a junction where I'm turning left if I've recently
overtaken a cyclist, to physically prevent him from overtaking
illegally. I wish it wasn't necessary to resort to this tactic.

It isn't necessary. Just don't overtake the cyclist if you know you'll be
turning left shortly afterwards.