Thanks CupraFan, It is for a Pioneer AVIC-D3 (USA version so no nav, but I dont care about that), £400 got it for, same one priced here is ~£1200.
I found info on a bypass for the dvd grounding the handbrake and moving the mute wire. Which wire on the loom is it for the speed pulse, i guess the reverse gear doesnt matter too much as not going to use nav.