“Fur thatchin is it? That’ll be twa bob a threave which is twa stooks which maks oot tae aboot twelve sheaves each, bit it micht vary roon aboot here ye ken.”

Translated:

threave: a measure of about 24 sheaves.

“For thatching purposes is it? That will be 20p in new money per threave which amounts to two shocks of cut sheaves stacked at about twelve each, although it might vary around and about in this area you know.”