I'm not sure you would be an apprentice having done your level 3 but I suppose you could be a level3 apprentice.
I started out as a mate but as a subbie and did nearly a year on site before going to night school whilst continuing on site every day and gradually taking on more complex tasks.
I was really interested, did a lot of reading, got on some really interesting multi million pound jobs and being 30 years old when I started, and working for my sister's boyfriend all helped as I was trusted and quickly given more and more responsibility.
Everyones situation is different, it might help if we knew a little more about yours?
Voltz