About a year ago I bought a fire blanket and wee fire extinguisher (600g powder type) for the kitchen. Finally retrieved them from my filing cabinet at work.
The blanket is on the wall already but the best place for the extinguisher is the same wall which has a radiator on it. Googling round says, as expected, keep away from sources of heat. How close is too close? Obviously I won't put it right on top of the radiator (couldn't if I wanted to, that's where the tea towel rail is) but is 60-70cm above it ok?
I don't want it there if that's no good but all the other spots are either out of sight or potentially awkward to get to depending on what has gone on fire.
Put the fire extinguisher out of the kitchen.
Picture a fire in your kitchen.
It is small, just started.
Smother it with the blanket. Leave the blanket on the fire until everything is cold.
Now picture a larger fire. Too big to smother with the blanket.
Kitchen is filling with smoke. You have to enter the kitchen to get at the extinguisher. You die of smoke inhalation.
Now, if the fire extinguisher was outside of the kitchen, you could get to it, squirt it in from the door (while calling fire brigade with other hand).