I've found some items in my cupboard which are questionable, one of which contains cotton seed oil.
I phoned the importer of this product this morning and asked if the cotton seed oil came from a genetically modified crop, and was told by a very nervous man on the other end of the phone that 'all the ingredients are natural'.
This didn't answer my question, so I'm digging further. I've emailed the manufacturer in India and am awaiting a reply. I'm going to keep searching through my cupboards and will let you know how it goes.
In the meantime, I'm starting to think more about seed saving...