Heres a post which you may or may not find useful. More aircrew orientated than Regt funnily enough but might be some crossover.
http://www.pprune.org/forums/showthr...highlight=OASC
Edit: Some of the IOT course info may be out of date as I think the course has changed to 30 weeks, new structure, content etc. Specifics on what the course entails will be better coming from someone 'in the know'. Sorry.