Never heard of "Harvo", but it sounds nice.
Is Ollie Rathbone related to the bakery people?
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Alternative "S"... or SALLY LUNNS - these were large sweet breadcakes/teacakes. The ones from Davis mobile shop in Brinswoth in the 1960's used to have icing on them. They may have been a Brinsworth variant of the original recipe though, which sounds more like a bun.
Love a sally lunn - they call them iced fingers now