Living in London is a rite of passage for many young Australians, but few manage to start businesses with a £9 million-plus turnover from their flatshare. Daniel Cray, Jonathan Knight and Rory Simmance-Freemantle, friends from their schooldays, came up with the idea for their company after becoming dehydrated on a flight from Melbourne to the UK in 2014. The result was Phizz, a fizzy electrolyte and vitamin tablet that claims to hydrate users three times faster than water alone.