CD Stuck in player

Hi everyone

I have a 51 1.6 Zetec with a 6006E 6xCD changer. I've put a CD into slot 1
today (a free one from a Sunday newspaper!) but it didn't play and the
player doesn't recognise the CD as being there - it just displays "No Disc"
when I try to select it. The other 5 CD's play ok, it's just CD1 with the
problem.

It will allow me to load another CD in the CD1 slot. It doesn't play but you
can hear the 2 CDs grating together and after a few seconds it displays an
error code. I can eject everything except this one CD which I know is there,
but the player thinks otherwise!

Any ideas how I can retrieve it?

Jeff