Hey Leah,
I trained with Oakley, the trainers are excellent and it was a small group - however with any one - two day course, I didn't feel confident after I had finished the course and I did have to go back and ask them for extra videos - which they did supply me quickly and they are available if you need to ask them anything after the course.
I researched heavily beforehand and Belle seemed to have more mixed reviews which is why I went with Oakley.
I don't regret it but be prepared to have to do lots of practise (which costs!) after the course.
Best wishes,
Lauren