No traditional pesticides: Unlike traditional head lice treatments which poison the lice, Full Marks solution has a physical action on the lice causing them to dehydrate (lose water) and die.
Whilst a comb is included, the Lice Breaker Comb is considered the best for removing head lice and nits.
Terry White Chemists sell both Full Marks solution and Lice Breaker Comb - they also have a price match guarantee :)
Ah nits, don't ya just love 'em!