It's been a talked about on here (a lot), but I've had 4 MK1 VRS's (two of which I've still got) and I've got a MK1 Octavia Estate L&K and none have had alarms. The most we got was an Immobiliser, and yes while there are Alarm settings within VCDS (Vag-Com) as you can change the country to set the volume of it, we never had it in the UK.
I'll double check my paperwork and see if it was an optional extra, but I'm pretty sure we it wasn't.
*2)The characteristics of the visual and audible signal may differ according to the country...
The above is on the same page, it wasn't an option in the UK. However, you may find that the hazards flash which is due to the internal interior monitor. If you can call it an alarm, it's very basic.
Some old posts:
As for the door micro switch.
This might be of some interest to you, it's a guide to replacing the door switch (which is built into the lock)