I've just hooked up a new headunit (more about that later) which allowed me to eject the (was defunct) cd changer cartridge. Should there not be any cd cartridges in these?

Apologies for the fuzzy phone picture

Hmm, looking at eBay.co.uk: VW AUDI SEAT SKODA 6 CD CHANGER CARTRIDGE MAGAZINE (item 230062064382 end time 16-Dec-06 11:22:45 GMT) it does appear to be complete... can anyone confirm?

That is complete, Q.

CD's are loaded with the label facing away from the grey tab. To release them you press the grey tab and push the CD's out from a hole in the back.

Excellent

Thanks Phil!