If you fall ill while on holiday, the holiday hours missed by you as a result will not be considered to be holiday provided you adhere to the rules of conduct for periods of illness that apply at your employer. You must also notify your employer of your illness immediately. You are expected to consult a doctor and to submit a medical certificate pertaining to the nature and the length of your illness. If in exceptional cases you are unable to obtain such a medical certificate, then the nature and length of the illness can, for instance, be determined from bills for medical treatment.