What age is it? My dads R reg golf gti has the standard immobiliser, which inbuilt into the key. Think this system was only introduced in golfs around P reg, before that there was no standard immobiliser fitted, not certain on that but pretty sure. Pretty sure the 8v like my dads also never came standard with an alarm, only extra or afterfit. With direct line, there list had volkwagen immobiliser on it, so choose that, they did want confirmation of this and we had to go to VW dealership to get a letter confirming it had it and also a print out of the original factory spec of the car.