As often found on London’s housing estates, these fences are made from WW2 Air Raid Protection stretchers. 600,000+ stretchers were made for civilian use in the Blitz; but surplus after the war. Estates’ railings had gone for War Effort: stretchers were recycled to replace them.
I’ve tweeted about similar before - I keep coming across more (the above are in SE1 Southwark area nr Bricklayers Arms) and more down around Lambeth into Kennington - they never cease to intrigue.
Addendum: @Blitzwalker has noted that the P in ARP stands for “Precaution” not “Protection”. I’ll stick to explaining archaic railway organisation acronyms in future
