A run down pub in Liverpool has doubled in value due to some graffiti on the side of it. The pub was originally worth around £495,000 before the graffiti appeared. It is now worth around £1 million after the graffiti was found to be the work of Banksy, an artist who is known for his images of vermin. The estate agents overseeing the sale have been inundated with offers from buyers looking for an investment.