10. Return on Investment for every £1 spent Source: DMA Catalogue Marketing £7 Other Direct Mail £15
11. Return on Investment for every £1 spent Source: DMA Catalogue Marketing £7 Other Direct Mail £15 Non-email Internet Marketing £20
12. Return on Investment for every £1 spent Source: DMA Email Marketing £44 Catalogue Marketing £7 Other Direct Mail £15 Non-email Internet Marketing £20