PET is very risky indeed (I have a stake there and have followed the company for 2 years) but that one you have to be already in to reep the really big rewards (if they come) as the sp responds very swiftly for reasons I'm sure you're well aware of.
I'm at a loss on PET (about 30%) but happy to hold as long as it takes.
VOG is a different kettle of fish altogether...........still undervalued imo and with very little risk.
I see £2.50 to £3.00+ here long term so I'm in here with a larger stake than I have in PET and no worries whatsoever!