Permethrin is an ingredient in most general Household Flea Sprays 
It is not known to rapidly harm most mammals or birds, but is 
"DANGEROUSLY TOXIC" to "CATS" and to "FISH"
 in CATS it may induce hyper excitability, tremors, seizures, and even DEATH.
Click here to read a really sad story about these products. 
Below is a small list of some such products that are taking Cats lives daily and it must be stopped.
 Johnsons 4FleaS Household Spray Extra Guard 600ml
 Ingredient(s): Permethrin 0.47% w/w, Tetramethrin 0.092% w/w, S-methoprene 0.095% w/w
Johnson's House Flea Spray Extra Guard 400ml ..
Ingredient(s): Permethrin 0.386% w/w, Tetramethrin 0.092% w/w, S-methoprene 0.0473% w/w
Bob Martin (IGR) Home Flea Spray Plus 500ml
 Ingredient(s): Permethrin 0.5% w/w, Tetramethrin 0.10% w/w, S-methoprene 0.05% w/w
Acclaim Household Flea Spray 400ml
Ingredient(s): Permethrin 0.58% w/w, S-methoprene 0.09% w/w
Beaphar Extra Long Lasting Household Flea Spray
Ingredient(s): Permethrin 0.19% w/w, S-methoprene 0.10% w/w Pyrethrins 0.05% w/w
Indorex Household Flea Spray
Active Ingredients: Permethrin , Pyripoxyfen and Piperonyl  Butoxide 
 
 Permaguard Household Flea Spray 400ml 
Ingredients: Permethrin, S-Methoprene
R.I.P Fleas extra
Ingredient(s): Permethrin, Tetramethrin, S-methoprene
http://www.ripfleas.co.uk/a-z/permethrin/
To the CEO's of 
Amazon, Pets at Home, Tesco, Vet UK
We the petitioners would like to ask you to stop stocking these Dangerous and Toxic products to Cat owners and there homes.
You are helping to kill and cause a variety of problems to unsuspecting Cats.
This is the truth.