The Department of Health (DoH) used data from Canada to estimate that the cost to UK retailers could be as little as £120 - less than one-tenth of the ACS' estimated figure. This costing has been hotly contested by retailers, peers, and even the Canadian company 4 Solutions, from which the quotes were sourced.
The company says the cost to a UK retailer would be about £480, excluding installation which could reach £1,000.
The ACS slammed the DoH's original information as "highly misleading".
Chief executive James Lowman said: "The briefings from government have downplayed the likely costs. This has portrayed an inaccurate picture of the cost and disruption that retailers will face to implement the law."