hi nickymitch, have a look at this website
http://www.nittygritty.co.uk/ng/index.jsp
the comb they sell is fantastic, it really does work. I haven't used the treatment or the repellent, but a friend has used them and says they are the best products she has used & they deliver the next day. In the meantime, have you tried tea-tree? You can buy tea tree shampoo and conditioner. In my experience, combing is the only foolproof method of getting rid of the little *******! Don't worry, they'll go in the end, and you can get back to looking at your children without studying their hair for signs of life.