As a small caveat, the 5.6 weeks (28 days) is allowed to include the eight statutory bank holidays, and almost always does (i.e. the worker can't insist that they not be paid for the bank holiday, and take the holiday day some other time). So the minimum amount of non-discretionary holiday that a worker can accrue is usually four weeks.

In practice the actual baseline offered in many jobs seems to be five weeks, plus bank holidays.