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In November 1915 four lists of occupations scheduled as vitally important for war work and other essential requirements were published.
List A; Occupations required for production or transport of munitions supplied by the Ministry of Munitions.
List B; Coal Mining.
List C;
(a) Agricultural Occupations.
(b) Certain Occupations in mining etc.
(c) Railway Servants employed in the manipulation of traffic and in the maintenance of the lines and rolling stock.
List D; List of Occupations (Reserved Occupations) of cardinal importance for the maintenance of some other branches of trade and industry.
Each of these lists had a detailed description of the occupations included, which were subject to revision as the industrial situation of the country demanded. More occupations in Food and Clothing were added in Dec 1915.
If you can get access to The Times digital archive, the issue for Monday, Nov 22, 1915; pg. 9; gives a list of all the scheduled trades that were
"vitally important at the present time for war work or for other essential requirements"For WW2 see
http://www.rootschat.com/forum/index.php?topic=674198.msg5191880#msg5191880Stan