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This seems like the way forward for retaining the path around the garden office
I'll likely go for old creosoted ones for a couple of reasons - they last forever, like you say, and they're cheaper.
I'm not worried about human contact as they just won't be anywhere that can be walked / played on.
And we'll wear overalls & gloves when I'm moving them (assuming I can rope my brother into lugging 100+kg lumps of wood around when he brings his chainsaw & trestle).
Agreed; I wouldn't particularly recommend softwood railway sleepers covered with creosote.
(Other than for building a railway with)