I phoned my local council offices about this as I wasn't sure and they said I didn't need a waste carriers license to take the stuff home but I had to give paperwork to the place I get it stating my personal details, the date and the amount of oil taken. I have to keep a copy of this anorl.
I had the eho at work 2 weeks back and he asked what I did with my waste oil so I told him that I take it home to be used as fuel, he didn't care about any paperwork for it.
Best bet is to phone your local authority and ask, I'm sure they all have different ideas about what you should do.