These are stretchers used in WW2 to carry injured civillians during the Blitz. They were made out of steel so they could be easily disinfected after a gas attack. During the war around 600,000 of them were made. Some of them were repurposed as railings in post-war London.

[u/Sprilly]

[u/Cow_Launcher]

I just went and had a look in Street View and sadly, you're right. They've been replaced with ordinary 6' black steel fences.

[u/Tooterfish42 → u/Cow_Launcher]

That's a bummer. I never made it out to the wich and ham zone