>The price of canned tomatoes has doubled, it said, from £15 a case to £30.<p>Not knowing how many kg are "a case" it is difficult to say anything, but on Sainsbury's site canned tomatoes are in the £1.38 to £2.50 per kg range.<p>Considering that on a pizza there could be at the most 100 g tomato sauce, at the most it is £0.25 value.<p>And this is a retail price.<p>So - maybe - the issue is about availability in quantities, but not the costs increase of the canned tomatoes.