The Committee contacted Lamb in February 1940 suggesting that he might make portrait drawings, 6 initially, at 10 guineas each, for the War Office and Admiralty, with a view to him then moving on to airmen.
Over the rest of the war, Lamb worked steadily, primarily on portrait and figure subjects, although, as he produced such a large number of works, they have not been individually mentioned here. He travelled to various bases in the UK, including in Essex, Sussex and the area of his home in Wiltshire. He also painted many Canadian subjects. As well as specific groups of commissions, he was given salaried appointments, replacing Eves as one of the War Office artists in October 1940. There is later correspondence about the possibility of a 6-month commission for portraits of commanders in the British Overseas Air Corporation.
In general his work seems to have been quite flexible, with plenty of freedom. He wrote regular letters to Dickey and his successors regarding his progress and activities. Sometimes these give details of the subject matter of particular works. There is also correspondence about expenses and about the WAAC's contribution to Lamb's rent of a studio in London.
In many letters, he comments at length on the latest exhibitions at the National Gallery, and gives his opinion on the work of other artists.
The post war correspondence includes a query about a lost work, allocation matters, and discussion of Lamb's materials and techniques.
The file opens and concludes with two leaflets for exhibitions at the Imperial War Museum.