Well It's bloody cold and someone asked me how I did it and what the wiring connections for a Skoda were. It was  -2degrees!. you can get the alientech from

 Alientech

well Here Goes! proceed at your own risk I take no responsibility

firstly remove door trim, the manual that accompanies the alientech is pretty good and is not wrong in any respect except getting the door handle trim off, do it from below, you WILL scratch it and at least from below you cant see the scratches, 

1.) remove all screws from around door, 7 off

2.)remove door handle (see photo) mirror control and top speaker. (and associated wiring) yes that is ice on the windows I must be bloody mad!!

3.) remove 3 screws from door handle and 1 from lever (door handle middle screw is longest one)

5.)lift door panel out at bottom about 2 inches then up, its tight/very tight

4.)undo cable from door lever-----do not forget to re connect this when putting it back!!! and all other wiring (alarm led and door open light)

fit alientech as per instructions using wiring details below.

alientech                                    car solid/trace

green                                        black/yellow

black                                         yellow/black

blue                                           brown

yellow                                        white/yellow

white                                         brown/yellow

orange                                        grey/red

red                                             grey/black

reassembly is reverse of removal but I advise you connect up the door control/locking without putting on the door trim and test everything first (before you re-assemble everything). Your finished look as to the wiring will look a lot better than mine as I had to figure out what wire went where!  it works with the Skoda without an alarm due to the safe locking system, if you disable that (led on drivers door does not flash) alientech wont work. it worked for me it should work for you. and here's another photo for you.