The 26-year-old with a £100m sportswear brand

It is hard to know how a then 19-year-old Ben Francis had the time or the energy to get Gymshark up and running.

While many young entrepreneurs have to juggle running their start-up with holding down a nine to five job, back in 2012 Ben was a full-time student by day, and a pizza delivery man by night.

"I'd wake up and go to Aston University [in Birmingham], then finish uni early afternoon, and work at Pizza Hut from 5pm till 10pm," he says.

"I could answer emails [about Gymshark] in between deliveries. Then I'd go home and sort out the website, and design new products."

After two exhausting years of this - with annual revenues of his nascent business hitting an impressive £250,000 - Ben quit both university and the world of pizzas to focus on his company.

Fast-forward to today, and Gymshark expects turnover this year to reach £100m.