One piece of data beats everything else. A quarter of a century ago, my dad taught me the best way to measure the health of our business was to look at the cash figure every day. Each morning at 10am, I get an email from Caroline in the finance team showing the cash we have in the bank compared with the same day last year. This fact offers no hiding place. The year-on-year comparison shows the strength of your cashflow and whether you are truly making money.