Quick answer
Internationally trained speech pathologists need Grade B (350) in each of the four OET sub-tests for HCPC (UK, registered as Speech and Language Therapist) and AHPRA (Australia) registration. The Writing sub-test tests your ability to communicate dysphagia and communication findings to a non-specialist addressee in 250 words of prose. Most marks are lost on Genre & Style: uncontextualised IDDSI codes and dysphagia classifications.