"Various reasons for using the word 'bivvy'. Fire regulations is probably one reason Rab use it here, but i usually use the word for a shelter used for only a night or two."
Good point. Here is a quote from the Integral Designs website...
"MK Tents do not meet the CPAI-84 flame retardent standard and are therefore not available for retail sale in Canada or the following US States: CA, NY, NJ, MI, MN, LA, MA"
Obviously many of us in North America are too stupid to use a tent properly and our governments do our thinking for us :(
Also, I wonder if the bivy has a different meaning in the UK or Europe. Sort of like cars (e.g., trunk = boot, hood = bonnet; or camper trailer = caravan).