A cut-away illustration of No. 10 Downing Street: 'the quiet backwater from which great men have ruled a great empire'. 10 Downing Street from the garden front with Nos 11 and 12 at right. Use of some of the principal rooms in 1940: 1. official dining room; 2. breakfast room; 3. cupboard; 4. official drawing room; 5. small drawing room; 6. boudoir; 7. Chancellor of the Exchequer's drawing room; 8. housekeeper's office; 9. kitchen; 10. clerical offices; 11. secretaries' offices; 12. Private