Leon1P did a write up.

Basicly there are the two slots at the bottom of the display, plus two other slots in the gap between the radio facia and the heater control panel (these are hard to spot, tourch may be required).

It looks at first as though the display panel should pop out, but the whole unit comes out.

IIRC Leon1P used some strips of stiff plastic to release the clips in the slots.
 
Hi Rob

What you replacing it with? I'm in Essex as well where abouts are you?

Rob
 
I'm in Chelmsford as i type, but live in Romford. Few other SEAT owners meeting at the Red Lion in Margaretting on 07 Jan at about 12.30, if your around.:D

Be good to see how you get on with the Pioneer.

Rob