An aqueous fabric conditioning composition comprises a solid particulate material, perfume and an oil. The boundaries and internal features of the domain are approximated with polylines. The plant includes the following operative sections: at least an apparatus for forming articles positioned upstream, at least a machine for packaging the articles in respective packs positioned downstream, and an apparatus for conveying the articles which is able to transfer the articles between the forming apparatus and the packaging apparatus. A Hall sensor is provided on a fixed side of the annular magnet. It is determined from a list of updated records that the records identified in the data request have been updated in the virtual data area. When spray is released, the system transmits a notice via the communication link.