I applied online through Tesco's recruitment website. The process was pretty quick. A recruitment officer called me the next day, asking me to describe my previous previous and academic background. Then, he sent me a link to complete on online 'Oxford English Test', and invited me to an interview the following week at Tesco HQ.
Before the interview day, I was told to bring a calculator to complete a quantitative test. On the actual day, I had to fill in an application form and spend 40 minutes on a math test. The test comprises 20 multiple choices, requiring basic calculations of business-related figures (ex. profit, margins, percents, break even point, etc). After the test, I was interviewed by the same recruitment officer, followed by the potential line manager.
I got the job offer a week later.