I did both Level 2, 3 and my first year of Foundation Degree as a volunteer. It depends on the college that offers the course whether you need to be in employment or not and if the school /environment you which to do the placement will accept you as a volunteer. There have been numerous adults that have done the course as volunteers at the school I did mine. It just depends whether the college will accept you as a volunteer and if the school where you do placement will have you as a volunteer. My level 2 and 3 were done through a local adult education centre and the awarding body was City and Guilds.