Rationing was introduced at different stages for various commodities on both a national and local scale. The following give details of the nationally rationed items.
Sugar - National rationing existed from 31 December 1917 to 29 November 1920.
Butter - National rationing existed from 14 July 1918 to 30 May 1920.
Margarine - National rationing existed from 14 July 1918 to 16 February 1919.
Lard - National rationing existed from 14 July to 16 December 1918.
Butcher's Meat (Uncooked) - National rationing existed under Meat Scheme from 7 April 1918 and under General Scheme from 14 July 1918 until 15 December 1919.
Bacon and Ham - National rationing existed under Meat Scheme from 7 April and General Scheme from 14 July until 28 July 1918.
Jam - National rationing existed from 2 November 1918 to 15 April 1919.
Tea - This was not rationed nationally but its distribution was controlled by national registration of customers based on 2oz. per head from 14 July to 2 December 1918.
If you are interested in reading more about rationing during the First World War click here for details of how to visit the Department of Printed Books.
British food control by Sir William H. Beveridge. - London: Humphrey Milford, Oxford University Press, 1928. (Economic and Social History of the World War : British series)