Looks like tha sat-nav version (same layout as my old P2 N16).
If so, if you remove the CD player, you`ll lose your sat-nav & I think the radio, as it`s all coded to NATS.
Anyway, iirc, someone wanted to do it on their N16, but you can`t fit a normal H/U to a P2, without re-designing the dash wiring, because the A/C, sat-nav & radio are all controlled through the same panel.
I maybe wrong, but it`s gonna be a right PITA to get it working properly.
Your best bet would probably be to put your H/U in the glovebox & re-route the aerial from the standard unit to the H/U.
Not sure if you`d lose the sat-nav signal if you unplugged the aerial though (mine didn`t have sat-nav).