Sir; re Hot When You Want production pauses' (The Grocer, April 20, p5). Thermotic Developments has to date sold and delivered six million self-heating cans to Nestlé UK since August 2002. Approximately five million have been sold through a range of outlets during a test in the Midlands. Retailers have revealed that sales are incremental, which has obviously resulted in great pressure for Nestlé UK to launch nationally. The sales figure stated of £113,000 is average weekly sales and not the total number of cans sold [ACNielsen]. Mike Jenkins Thermotic Developments Editor's Note: Information Resources has asked us to point out the figure it provided should have read sales of £813,000 across the major multiples alone. {{LETTERS }}