Balmer and Ashley,
Are you talking about the drops you can put on the back of a cat's neck that wards off fleas for months? I haven't had a pet here, so I don't know if they have it here, but in the States there's an anti-flea liquid drop you can get for cats (and dogs) that wards off fleas for several months.
Speaking of cats: I'd like to adopt two small kittens, if anyone knows of any (not that I wouldn't adopt adults in a heartbeat, but Andrew is very indifferent to cats, and I'd like to see him resist the allure of two kittens growing up together, playing with each other, etc.). Please let me know if you know of any litters in the southeast area of England (within reason, say, in Sussex). We'd offer a great home, and I already have visions of kitty condos, "Marty Mouse," catnip balls, etc., in my head.
Suzanne