I'm not sure if it's because I am buying brand new that they are having to 'factory order' but it's not like I requested any other toys to it.....
A factory order is brand new. As far as I know they don't just churn them out willy nilly hoping punters will buy them. Yeah I suppose they will make a few that haven't been ordered that will go to garages but the fact you want a bog standard one still means it has options ie paint, manual and doors so they have to make it as it is probably slightly unique as most folk go with at least one extra.
I suppose the reason they don't have cars just lying around already built is because of the hundreds of combinations you can get, colours for a start then the manual / dsg boxes, then all the other countless extras, lights, stereo, wheels, interior, cruise, camera, parking, winter, luxury, sunroof, 3 / 5 doors and so it goes on.
The car itself actually only takes around 2 hours to be assembled. Its the length of time it takes to actually get on the production line and then shipped over that slows things down.
There is a guide here that is worth a read
http://www.golfgtiforum.co.uk/index.php?topic=209383.0Also search the forum as there is literally every question you could think of been previously asked but the guys on here are really friendly and will try and help you out. Welcome aboard.