When you accept a job, the expectation is that you will attend.
In highly exceptional circumstances, you will be permitted to terminate your agreement to work with a school before you have started the job. Such exceptional circumstances would include severe illness, family bereavement or similar.
In such a circumstance, you should contact the school as soon as possible using the phone number provided as part of the job description. This will allow them to cancel re-post the job on Teacher Booker or make alternative provision. Please do not contact Teacher Booker as the software provider.