Sir, - An article in "On the margin" (August 30th) states that Superquinn has beaten the British supermarket chain, Safeway, to the use of portable scanners. I am afraid this is incorrect, as Safeway's Glastonbury store (Central Somerset) has been using the system for the last year at least. - Yours, etc.,
Department of Agricultural and Food Engineering,
Earlsfort Terrace,
University College, Dublin.