Christina and Rohan spent thousands converting a 1960s industrial cargo ship into a spacious luxury 3-bedroom houseboat moored in London - and have announced they are raffling it for a fiver.

The dream of traversing the depths of space and planting the seed of human civilization on another planet has existed for generations.

If you've ever fancied yourself a spaceship architect that could design a vessel to carry colonists to another star system on ...