You must also have been:

• Paying national insurance contributions.
• Unable to work due to sickness or disability for at least four days in a row (including weekends and public holidays).
• Getting special medical treatment and unable to work for two or more days out of seven consecutive days.

Or you must:

• Be aged between 16 and 20 (or under 25 if you were in education or training at least three months immediately before turning 20).
• Have been too ill to work because of sickness or disability for at least 28 weeks.
• Have been too ill to work before you turned 20 (or 25 if you were in education or training at least three months immediately before turning 20).