Hi Fay,
I used to use lots of folk music and song in my classroom when I was a "real" class teacher. I now work for the Education Support Team for Looked after children so I don't have the same opportunities.

Have you got the EFDSS education resource packs? I did a whole term's project on May, culminating in a Mummer's play and performance of lots of traditional songs.
I also have the Midwinter pack but have not actually taught it.

When I was a music co-ordinator I used the "Growing with Music" scheme which has all it's roots in traditional music - well worth checking out.

I know the "Voices foundation" does lots of teaching in schools using this approach, their website should give you lots more info.

Hope this is helpful, PM me if you want to know more. (via 8-Pints to save me changing to my cookie every time I wat to post something!)

Sue vG