Whether you are planning for Estyn or for the categorisation, you need to integrate all the elements of your school life into one document.
When 'things fall through the cracks', you either need to run a SCRUM or a Kanban board. If you do not, then the quality calendar is key.
Find a basic calendar here. Adapt it to your own school. It is not an easy document to build but you will learn to rely on it.
Link to updated categorisation document
Link to Changes to inspections from 2017