Trinity College Teacher CPD programme is made up of six sessions, between January and October each year, that each provide up to date practical information and guidance relating to the Oxford application process and the purpose of each stage, for example, the admissions tests and interviews. They also have the broader aim of providing teachers and colleagues with guidance that will help them to support their pupils in all higher education applications, as well as those who may have the potential to apply to Oxford.
Please register for the upcoming programme here and see specific dates here. Whilst the programme begins in January each year, they encourage teachers to join at any point or just for those sessions they would find most helpful. As part of this programme, Trinity College also offer a free Teacher Enrichment Residential (details here) which is again completely optional.