Behind the wall is the site of Paisley Gasworks. Founded in 1823, it was one of the first gas works in the west of Scotland.
Maps from the 1860s show a railway siding serving the site and also the Craigielee Chemical Works at the west corner of the Gasworks. Maps from the 1890s show that the Gasworks expanded to the east, to this boundary wall, and the large gasholder being constructed. This gasholder is no longer in use, but the supporting frame can still be seen.
The same maps show that the Craigielee Chemical Works have been merged with the Gasworks and the area adjoining the site became a children's playground. Across Blackstoun Road? A school. Unlikely to be something that would be consented to these days...
The main site closed around the mid 1960s and gradually reduced in area until the early 1990s. I recall the dome of the gasholder still being visible in the mid 1990s, but now only the frame is visible.
A magnetic nano. Stealth required with the industrial units across the road and it is a bit of a stretch. Bring your own pen and a means of extracting the log.