Hi folks, after a bit of help.
just swapped my gti bootlid with one from a breakers yard as mine was rusty and had a dent.
Firstly i just disconncted everything and connected the wiring from the new bootlid and the boot wouldnt open, and the alarm would lock but not unlock.
i then noticed that my original had different wiring with a blaupunkt box and two ariels on the windscreen.(new one had one aerial and no blaupunkt box)
I have now transfrerd everything over and still the same. Only way to unlock the car is with the key in drivers door and press the boot pop about 5 times for the boot to open.
Any ideas folks??