London 2012 Olympics: Jessica Ennis denied career best time in 100m hurdles after blunder in Manchester We'll conduct a thorough investigation and find out what happened and why and by whom. It's a very unfortunate mistake, we're very unhappy about it. Ennis will next weekend compete in her first heptathlon of the Olympic year in Gotzis, Austria, against her rivals for gold in London. She would still have won today's race even with 10 hurdles as she was pulling away from the rest of the field at the finish. Harper was second in 12.86s with Carruthers third in 13.02. Dwain Chambers received a warm welcome from the crowd in his first race in Europe since being cleared to qualify for the Olympics. The controversial sprinter, who served a two-year drug ban after testing positive in 2003, is eligible for the British team after the British Olympic Association lifetime ban on drug cheats was overturned by the Court of Arbitration for Sport. He was greeted warmly when introduced on the startline and was clearly enjoying himself. He finished the 150m in second place in 15.27, with American Wallace Spearmon winning in 14.87.