Maybe not on their own ceres, but if you add together the branches of Poundland, Poundstretcher, home bargains, B&M, etc, I think they would have had a big impact on the Woolies trade.
Big tins of biscuits, that takes me back. Mum and dad had a small shop and used to stock those biscuits (Huntley and Palmer springs to mind). When the tins were empty they used to store pound and ten bob notes in them, to keep them crisp. ;D
valmarg