All new lecturers have to do this, usually as a condition of passing their probation period. It's not called HEA but usually something like PG Cert in academic practice, which gives you the admission to the HEA fellowship. It's quite practice-based so to enrol on the course, you normally need to be doing a certain number of hours of teaching, so may not be viable at the moment. I also don't think it's something universities expect you to have before starting a post. It is only a qualification for universities, so for schools you'd need to do a PGCE or school-based training instead,