The top 10 biggest yachts in the world

Have you got a spare £400 million lying down the back of the sofa? Is one your parents a Russian oligarch? Maybe you've recently won the Euromillions several times?

Well if so, these are biggest, baddest, most extravagant superyachts ever conceived, all you've got to do once you buy one is hire two dozen crew members and find somewhere to moor the thing. Easy!

Complete with gyms, dance halls and helipads (one even has its own submarine!) the ten longest superyachts ever constructed rival some cruise ships in their volume.