The only thing that stopped me having a go at one of those was the presence of mushrooms. For research purposes, of course. It can't possibly have been as gross as a small chicken in a can, after all.
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Indeed, generally a much more pleasant all round experience.
I did that free Jean Michel Jarre thing in the Docklands walloped on said fungus, late 80s I guess, spent a while wandering utterly lost around an area I discovered to be Plaistow.
On other days we would get a bus from Turnpike Lane and spend a few hours quite lost in Trent Park.