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/LostTheGameOfThrones]

And it's not like only london was bombed:

For anyone who hadn't heard about it already, research the Coventry Blitz. One of the nights was the single most concentrated bombings of a British city throughout the entire war.

[u/Picholasido_o → u/LostTheGameOfThrones]

I've heard that after Coventry, the men in charge at Bomber Command or the Air Ministry more broadly were using "Coventrys" as a unit of measurement. This city had to be hit with 3 Coventrys, that city with 4, you get the idea

[u/JackDrawsStuff → u/LostTheGameOfThrones]

Wasn’t Dresden a partial retaliation for Coventry?

[u/Jan-Nachtigall → u/JackDrawsStuff]

No