Prefaced by note 'Engine W1X. Received from B.T-H. Co., Rugby, and installed on cradle in Test House No. 2, Power Jets, Lutterworth, 11th. December 1940'. Covers period 1940 Dec 13 to 1941 May 20. Comprises details of test runs and subsequent inspections, modifications and repairs. The total running time was over 63 hours.