A trick I sometimes use with KS5 students (probably less appropriate for KS4/BTEC), when you don't have an org chart, is to look at the job titles of the executive directors by researching the investor side of the company's website. This tells you a bit about how the company views its functions, markets and aims at a strategic level. It's also a way of introducing stakeholders (different websites for investors and customers), and it reinforces teaching about big corporate groups by showing that Tesco plc is a very different beast from the-Tesco-store-down-the-road. For Tesco, this can be found at www.tescocorporate.com/plc/about_us/. Every big corporate customer-facing website will have a link to their investor-facing website, which usually tells you about their board of directors and/or exec committee. It's well worth a look.