Paris Lees is a transgender activist in The UK. I believe she was the first transgender presenter for one of the BBC channels and a radio station. The debate starts at 21:47.
http://www.bbc.co.uk/programmes/b040z014
Both women were very articulate and intelligent and made good points.
However, it was disappointing in that they mostly agreed. The woman advancing the radfem point of view made the point of saying that she personally hasn't and wouldn't exclude trans women or consider them not fully women, so we didn't really hear that side of the debate.