www.gov.uk/government/news/armitage-pet-care-flea-and-tick-drops-for-dogs-and-armitage-flea-drops-for-cats-and-kittens-product-defect-alert
"An unknown quantity of the Armitage Pet Care Flea and Tick Drops for Dogs containing permethrin has been distributed in packaging labelled Armitage Flea Drops for Cats and Kittens.
Exposure to even small quantities of concentrated permethrin can cause severe and fatal poisoning in cats.
If you have one of the products, do not use it on your cat."