So, DS (6), and DD, (14 mths) have come home with what DS informs me are correctly called "visitors" (I am told off regularly by him for using the words "lice", "louse" or "nits") so it was straight off to Boots to buy the gunk. So expensive! The cheapest one was no good as it had to be done daily for a week, some required a long period of siting there and so I went for the one that takes only 15 mins, bearing in mind I had to sit with the baby playing games and singing songs to keep her hands out of her hair. £17.99! DH is an industrial chemist and read the ingredients. His estimate is a fiver tops! What a rip off!