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There's an HG992 in a charity shop in town, £8 boxed. Haven't checked condition but everything is at a minimum PAT tested. By the box graphics I'm guessing 90's.
EDIT: B&D website states last manufacture was 1984. Maybe 30 years is a little too far to stretch on this kind of device.
EDIT EDIT: Further reading, first I need to find a lead-paint test. Hadn't even considered the risk when I stripped back part of the old white paint by hand. Oops.
You can find the Black and Decker KX1650 for under £20. The modern version of mine is the KX2200 but that's obviously more than you want to spend, or need.