[holding answer 18 June 2007]: The Office for National Statistics publishes annual figures for Product Sales and Trade: Quarrying of Limestone, Gypsum and Chalk (excluding Uranium and Thorium Ores) in PRA 14120. However data on volumes of UK manufacturer sales of limestone are not available. UK manufacturer sales of crushed limestone aggregates are reported as part of crushed stone of a kind used for concrete aggregates, for roadstone and for other construction use excluding gravel, pebbles, shingle and flint in the ONS report Product Sales and Trade: Operation of Gravel and Sandpits in PRA 14210, but are not separated from many other aggregates.
HM Revenue and Customs Overseas Trade Statistics give the following figures for imports of CN25210000 limestone flux, limestone and other calcareous stone used for the manufacture of lime or cement, and of CN25171020 limestone, dolomite and other calcareous stone, broken or crushed for road metalling, railway or other ballast:
Quarter CN25210000 CN25171020 2004 Q1 0 78 Q2 2 114 Q3 2 105 Q4 6 91 2005 Q1 25 103 Q2 38 128 Q3 30 172 Q4 31 107 2006 Q1 3 103 Q2 14 108 Q3 4 37 Q4 2 57 2007 Q1 5 51 Source: Overseas Trade Statistics