Yes they are.I know this is irrelevant to this thread, but bugger me this always annoys me. Students are not exempt from income tax!The reason he pays no tax is because the personal allowance for every single person below the age of 65 is £6475 per year.
Any funding, grants etc. given to a student are tax-exempt. A postgraduate student gets tax-free money (someone I know got 16k per year of his PhD). They don't pay council tax. And I've never heard of a student filling in a tax return on his or her income, even if it's above the personal allowance.