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NotThamesWater-
Not a lot, other than the plaster. It's a bit odd, feels like a metal lintel, although that wouldn't sit with the age of the house I don't think. Anyway there's at least an inch of build-up so I've just gone with plugs for now. They're the Fischer duo ones so in theory should work in either scenario
Polygon
Anyone got opinions on what could be going on here? Drilled in with masonry bit, goes through initial later of plaster easy enough, hits something harder, the suddenly gives in to what feels hollow. Also sounds hollow when knocked on. Was going to use plugs to hang a curtain track but seems like stone kind of plasterboard fixing might be more suitable.
Context: Victorian house above bay window