Julian Hunt The industry's most authoritative measures of retail market shares are being restated to take account of the fact some food chains have been double counting bogof promotions. The practice was highlighted by the recent controversy surrounding former Iceland boss Malcolm Walker and his decision to sell shares ahead of a profit warning. Other chains have also double counted their bogofs in the past ­ by including the value of both items in sales figures even though only one is paid for by the consumer. There's nothing wrong in this practice as it does not affect the bottom line figures reported to the City. But trade sources insist it has helped over-inflate some like-for-like performances in the figures collated by IGD. And IGD confirmed its six- monthly market share figures would now be restated. "We were aware of the issue. We are working with retailers to resolve it and will release new data with our next figures," said a spokeswoman. "This does not impact on total market share or the market share of other retailers. There will be a minimal difference for those restated." One retailer agreed the impact would be minimal: "The number of chains that accounted for bogofs in the way Iceland used to are few and far between. All the big boys do it straight." However, The Grocer understands IGD has also reviewed the way chains submit data used to compile the highly influential weekly sales figures circulated among its retail members. Any changes here would be far more significant ­ and controversial ­ as these weekly figures are used by the industry to benchmark like-for-like performance. The Grocer has been told retailers have agreed that in future only data based on the transactional value of goods will be submitted to IGD. They have also agreed to work towards a common definition of the sort of non food items that should ­ and should not ­ be included in the figures collated by IGD on behalf of the industry. We also understand the changes will be backdated so that previous figures can be cleaned up and restated. {{NEWS }}