That's "asbo" as in short for asbestos, not anti-social behaviour order. Andrew Gordon is the unlucky keeper of this particular shed. He's convinced it is held together with the rather unpleasant substance.
"Even the floor is covered in a thick layer of cement dust and what looks like broken bits of asbestos," he writes in a recent email to this blog. Eugh ...
"And we thought allotments were healthy places," he concludes.
Indeed. Well, it's quite often not the case. Asbestos was flytipped a while back on my site, and older sheds are often home to elderly cans of all kinds of dodgy, now-banned chemicals, doors covered in lead paint and the like. And soil can be contaminated with bits of plastic, glass and much worse (hence: always wear thick gloves when clearing a new plot).
On a brighter note, the greenery on top of this shed softens the industrial look. For aesthetics, this shed gets a healthy six out of 10. For health and safety, zero.
Meanwhile: an article from the Guardian newspaper on the Australian men's shed movement.