Hi Mikey
Best thing would be to do the course and see how you get on - if you're safe training to that kind of depth once you've done the course, then we'll let you. Most people are training to around 20m after the course, then grow from there - it has to be quite organic and take it as it comes.
But we do have people training to 70m and beyond - so if 30 is right for you, no problem
next course with spaces is the one in early August - details are all on
www.learntofreedive.com
We do have some "no fins" experts in the club so maybe once you've done the course, you could do a deal with one of them for a bit of extra specialist coaching. Or just buy them a few beers or something...
See you soon perhaps
Sam