I have added several political broadcasts (1929-1987) to my page on the Labour Party. Students might find the change in style interesting:

http://www.spartacus.schoolnet.co.uk/Plabour.htm

also the change in substance - very useful this John thank you

I will do one on the Conservative Party. In the meantime here is one on Margaret Thatcher:

http://www.spartacus.schoolnet.co.uk/COLDthatcher.htm

thanks - Craig Lamson in drag

You will find the History of the Conservative Party here:

http://www.spartacus.schoolnet.co.uk/Pconservative.htm

The first Conservative Party broadcast I can find dates back to 1931.

I have a page of lesson resources on the changing ideology of the Labour party here
http://www.educationforum.co.uk/sociology_2/socialism.htm