Possible Clues:

• Eventual defeat at cards brings connection with London banks
• Play by Robert E. Sherwood
• Untidy drawer with big tool on top of enormous spanner
• 1940 film starring Vivien Leigh and Robert Taylor
• End of major war game that one may come across in London
• Battle over game that links London banks
• Battle game in London
• Lawrence initially appearing in War Games, a classic British film