All applications are now through the GOV.UK Find and Apply portals.
You can search for postgraduate teacher training courses via Find postgraduate teacher training – GOV.UK This opens on 5th October 2021 for courses starting in September 2022.
Applications are via https://www.apply-for-teacher-training.service.gov.uk/
Applications can be submitted from 12th October 2021 for courses starting in September 2022.