Hehe- you probably saw female roundworms, Sternn; they can grow up to six or seven inches long. At the shelter, we call them the Nasty Spaghettis (although Cthulhu is far more evocative and descriptive, as the general reaction to them is, "Ia!").
They can easily be remedied by a few doses of pyrantel pamoate (the brand name in the States is Strongid; not sure what it's called in Ireland) or other broad-spectrum dewormers such as Febantel (Drontal) or Fenbendazole (Panacur). The latter two also kill tape- hook- and whipworms. If your cat goes outdoors and hunts, he's likely got them as well.
And yeah, you need to have him checked by a vet. Anything you can buy over the counter is probably, er, shite.
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