Britain's Christine Ohuruogu tonight produced a storming finish to claim a silver medal in the defence of her Olympic 400 metres title on home soil in London.

Ohuruogu, whose family lives so close to the Olympic site in Stratford that she could walk to the stadium, looked out of contention with 120m to go before powering down the home straight in trademark style.

American Sanya Richards-Ross took gold in 49.55 seconds with Ohuruogu clocking a season's best of 49.70secs, just 0.02s ahead of another American DeeDee Trotter on the line.

Britain's athletes have now won four medals in less than 24 hours after golds for Jessica Ennis, Greg Rutherford and Mo Farah on Saturday night, with the pre-Games target set by UK Athletics head coach Charles van Commenee of eight - with just one of them gold - looking highly conservative.