Ok, so by the sounds of it it all depends on the quality of the bio one makes?? So far it sounds like I will run my 300tdi on bio, so I guess my next step is to get this book you guys recommended and check it out. Im also going to have a 'serious' chat :D with Justinc to get something started as a cooperative maybe (chip in $ and labour to make it).
Thanks all for your replies.

