You need to use some removal "keys" which poke into the slots underneath the head unit.
 
Cut up an old credit card into two strips that fit into the hoes, then push them in and then away from each other and pull! Jobs a good un!
 
None, just make sure its wired like this.... red to yellow not red to red or the HU looses it memory every time you switch off.
wiring.jpg
 
I use cable ties ;-)

How do cable ties work? Just tried this as I need serial no. to get radio code but cant figure out how to do it. I push them in but nothing happens, can hear a click in the left hand one sometimes but thats it.
 
Argh..I need the radio code for my car so I can do an ECU reset. Phoned Seat and they said they can't do it over phone anymore and car has to be booked in to the workshop to do it! [:@]