A testicular cancer charity has today turned London’s Westminster Bridge into a head-turning installation to promote Testicular Cancer Awareness Month (April).An oddity in the 162-year-old bridge’s architectural design has been harnessed to communicate a powerful message to the public and MPs.When the sun shines through the apertures in the side of the bridge - hundreds of penis-shaped silhouettes appear along the pavement. 497 of them to be exact.The pavement posters which read ‘This is a sign to check your balls’ – are visible to the thousands of pedestrians that cross the bridge every day including dozens of MP’s enroute to work at the Houses of Parliament.