Welcome Hamish!
I love that character in Brave Heart! Nothing like a true and loyal (yet fierce) comrade!
I work in an office, but now live in a rural area so I have two types of daily use knives depending on if I'm in the city (work) or country (home).
For work I keep a Scrapivore in a small emergency kit as well as a Yard Keeper LE in a backpack. I also pocket carry a Spyderco Delica4 because Bussekin haven't released a folder since I've been buying their products (5 years now).
At home it depends on what I'm doing. While working outside a good 5" to 7" fixed blade is a constant companion. For these roles I typically use one of the following: Scrapper 5CG, Regulator, SOD or Swamp Rat RMD. There are times I also carry a Swamp Rat Rodent Solution as I find a smaller blade to be better for "detail work".
If I ever have to fight zombies off my land <img src="/ubbthreads/images/graemlins/rolleyes.gif" alt="" /> then you'll most likely find a Swamp Rat Chopweiler or Busse NMSFNO strapped to my hip. If the zombies pushed me off my land you'd find a Dogfather with a companion Swamp Rat Warden in place of the Chopweiler or NMSFNO.