Found this morning on Freegle.

'An unknown/unresponsive tradesman has left a large, heavy petrol lawnmower on my property in ..... He has ignored all texts, phone calls, and emails and request on Nextdoor.com for over five weeks. The machine is heavily rusted, missing its rear grass collector and I cannot find a visible serial number on the outer casing. Due to the suspicious circumstances, the ghosting, and the lack of identification markings, I suspect he may have intentionally fly-tipped/abandoned it.   Please collect for FREE if you can use it.'

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Probably one of the more 'fly-by-night' casual gardeners/clearance chaps.  Bloody Pikeys  ;-)

He may have just dumped it, possibly after stealing a better replacement from a previous call  ;-(

Some of these chaps, especially the real 'chancers', cover a wider than normal area.  Perhaps it was a genuine mistake, but when he costed up the diesel to come back for it decided recovery would cost more than it was worth.  Especially if he hadn't paid for it to start with.  Or had recently 'liberated' a better one from a previous job and needed the space in his van.

Gyppo