Andy Leighton gurgled happily, sounding much like
they were saying:

Of course a cyclist should be considerate and not unduly hold up a
stream of traffic but it should be up to the cyclist to decide when it
is safe and appropriate to move to secondary position.

....by moving towards the left to make it easy for the other traffic to
pass?

I'm not reading "should keep over to the left" as advocating cycling in
the gutter, merely being considerate and not holding up other traffic.