If the cause of earache is an ear infection, there may be a watery or pus-like fluid coming out of the ear. Outer ear infections (infections of the tube connecting the outer ear and eardrum) and middle ear infections (infections of the parts of the ear behind the eardrum) are very common causes of earache.
Umbrella company contractors only have to keep personal tax records, as they are employees, not business owners. If you are an employer, you need to keep all PAYE records for 3 years (in addition to the current year). A CIS contractor must keep his CIS records for the same period of time.
If you have former employees who are eligible for COBRA, extending their health benefits, you should also keep those records for six years just to be safe. The law doesn't specify retention, but since this could apply under the Employee Retirement Income Security Act (ERISA) this law requires retention for six years.