Hi,
page 139 of the CYPW handbook explains how the Health and Safety Act 1974 for Great Britain gives overall responsibility to the employer but also gives duties to employees.
If you
search in the amazon preview for the words
Health and Safety Act click the link to page 137
Page 28 of the EYFS framework (if you work in England) also requires you to report accidents, incidents, injuries, signs of illness and other emergencies, to parents and that the setting keeps a written record. If you ask your setting/placement about this you may find a colleague has designated responsibilities for reporting to external agencies and who these are (OFSTED? HSE?)
Hope this helps a little xx