Hi Lissa, I'm not from the UK - I'm from Australia and I've been involved in managing a Child Care Centre in Australia for around 16 years. We've just had some new regulations passed that requires all staff now to have at least a basic qualification (6 months course). Previously you could get a job without qualifications as an Assistant provided you worked with and under the supervision of a Diploma trained staff (2 year course) in the relevant age groups.
I know our system is different to yours - just thought this might interest you!
Good luck with your research.
Kangaroo