In reply to Quagmire:
> i am wondering if i have any chance of getting an instructors position with these offences. My question is will i be wasting my time and money chasing this dream job and end up being unemployable.
These days the vast majority of the outdoor activity/instructing workforce is made up of independent contractors/freelancers who work for several providers. There aren't many outdoor centre jobs around, especially in the 'traditional' sense of working 9-5 at an LEA centre with your ML, SPA and BCU quals.
I'd also hazard a guess that there is now much more work around working with adults on challenge events etc than working with children or vulnerable people.
With regard to DBS and your past - there are a few people out there making a good living with similar convictions and worse. As long as you don't try to hide anything then it shouldn't hold you back.
Good luck with your quals and career change.