HI. I am also SA teacher but been here in the UK 3.5 years...not going to go in to too much detail as you can read a little of my expereince on a post titled 'Do UK not want OTT?' (or something like that...) If I were in your shoes,I wouldn't waste my time trying the OTTP or GTP...they are very difficult to get onto and impossible (OTTP) if you are already not employed at a school. PGCE would be your best bet. Good luck.