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You need an SDS drill, and a small enough SDS bit which is suitable for the task. It will feel like using an HGV to crack a walnut, but it'll work.
Had the same in the extension bit of our flat - one roller blind bracket has a screw missing; I simply couldn't make any headway with a normal drill (this is before I owned an SDS drill).
Ben689908
It is nice to know I'm not alone.
I wonder if some sort of carbide tile bit might eat the lintel better?