I note (via the ISP website) that Which? researchers claim to have discovered offers in M&S, Waitrose, Sainsbury and Tesco that allegedly broke the new government regulations on unfair commercial practices - these concern, for instance, the requirement for goods to have been on sale at advertised higher prices for at least 28 days in that store, in order for claimed discounts to be considered valid, that kind of thing. I imagine these are mostly mistakes - otherwise that wouldn't be very good PR, would it? - just like the one the eagle-eyed Telegraph reader photographed last week in Tesco: a "2 for £3" shelf-talker, also advertising single purchases at £1.47.... isn't that 'Buy One, Get One Dearer'?