Just fitted an electric aerial off ebay (generic aerial not vx) and it was surprisingly easy because the wiring for it was already there. I also spotted 2 thick red/yellow wires going left to right across the body of the car when fitting an alarm. I think these are elec window wires. If 2 are heading to the drivers side does that mean there is possibly the elec window wiring for the rear windows ?
Also does the MK3 typically have most extra wiring as I might look at putting elec mirrors in it.