Petzl Spatha, 2 choices, short and serrated (better for cutting rope etc)or long and straight (better for making butties). Both have a large hole for clipping to an oval carabiner or tieing some cord to. Easy to use whilst wearing thick gloves.
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http://www.amazon.co.uk/Leatherman-Z-REX-seatbelt-cutter-rescue/dp/B00AJK7QH6
http://www.amazon.co.uk/Tactical-Triage-Auto-Rescue-Tool/dp/B0085P4TWW/ref=pd_sim_sbs_sg_2
But if you want really cheap and simple: http://www.amazon.co.uk/Draper-61229-Emergency-Hammer-Cutter/dp/B0001K9XNE/ref=pd_sim_sbs_sg_3
My station just bought in some which would fit the bill. Serrated section on blade, integrated belt cutter and window stud in the handle. Locking blade and easy to open even with fire gloves. Seem like pretty good quality but not sure of brand - will check for you
I've got a [url= http://www.heinnie.com/Kershaw-Knives/Folding-Knives/OD-1/p-158-1003-4000/ ]Kershaw OD-1[/url] which i carry when i'm on my mates farm, very handy and i can open it one handed in a split second when needed - holds a very sharp blade for a long time despite being used and abused on the farm for numerous jobs, for all other times when a 3" blade is a bit ott i tend to carry it's little brother the [url= http://www.heinnie.com/Kershaw-Knives/Folding-Knives/OD-2/p-158-1003-4260/ ]OD-2[/url], still a good knife but not quite as good a quality steel blade but perfectly acceptable for a small unobtrusive pocket knife


