Are you ready for the Games? Andy Murray passes the Olympic Flame to Venus Williams at Wimbledon on the 66th day of the torch relay.

Will Britain be able to turn the home advantage into the top spot on the medal table this Games? Predicting medal counts is a tricky business, but, never afraid of a challenge, we will reveal our own predictions for the top 20 countries here on Plus on Friday. In the meantime, why not come up with your own mathematical method for predicting the results? To help you along, here are two articles we produced for the 2008 Games in Beijing:

• Harder, better, faster, stronger — looks at how the population size and GDP of a country affect its Olympic performance
• The home advantage — looks at how hosting the Games affects a countries performance.