The craze for selfies, which every self-respecting child and teenager is currently participating in, has created an unusual and unexpected side-effect – head lice are spreading at an alarming rate. The lice spread by contact – contact which is more prevalent than ever as kids squeeze together to get in the latest at-arms-length shot.

Now here’s the thing – treatments and remedies are unregulated and desperate parents will happily hand over large quantities of their hard earned money in exchange for a solution. The Lice Centre, based in Connecticut in the US charge $200-$500 for a house call. They now have 10 employees in 14 states. Turnover is in the millions.

Is this something you could do here in the UK? It’s not the most glamorous business in the world, but those yielding the biggest profits rarely are.