How would it work without the infrastructure? That's my point. This was the quote: "insisting cyclists travel in one direction only should be seen as being like insisting that pedestrians only walk in one direction where there are one-way streets"
That seems to suggest that on eone-way streets treating cyclists like cars is daft and that they're actually like pedestrians. But unless you put contraflow markings on the road then just how does cycling two-ways on a one-way street work - instead it creates conflict by either cyclists riding like salmon without any markings in their favour, or on the pavement without them being shared use. So the comparison with pedestrians in this instance is incorrect because, where a street has been made one way, pedestrians automatically have the right to travel both ways, whereas to confer the same right on cyclists would necessarily involve new infrastructure (even if that's just paint on the road).
I'm not resistant to the idea, note: "agreeing with a general principle that we should have contraflows", I was resistant to the direct comparison with pedestrians on one-way streets which is completely wrong.
And xseriously, does anyone actually read what I actually write on Princes Street? Again, once more, for the umpteenth time, I'm not saying I would be resitant to a contraflow lane there, not in the slightest, I would never say, and never have said, that we shouldn't have it; but rather, for the gazillionth time, that if George Street is done correctly I don't think Princes Street contraflow is a big miss. I'm afraid that's a HUGE difference from, "you are so determined to resist this principle".
So let's sum up. One-way contraflows for cyclists = good, great, super, I'm fully in support. Cyclists being able to travel against the flow on a one-way street without either infrastructure in place or a shared use path = bad. Saying that cyclists should be able to use one-way streets both ways because pedestrians can do so = missing the point on fundamental differences between the modes of conveyance.
One last time - one-way contraflows for cyclists are to be applauded and desired. In certain, very specific, situations they may not be possible (e.g particularly narrow street on which a contraflow lane genuinely cannot be fitted, with a particularly narrow pavement which cannot be rendered shared use); and in others, while desirable, might not be missed because of alternatives available (in my case, this covers Princes Street, though I'm aware many more people don't want to have to cycle all the way up to George Street and not be able to ride to a shopfront).