Britain today suffered their second high-profile disqualification of the World Championships in less than 24 hours after Dwain Chambers was guilty of a false start in the 100 metres semi-finals.
Chambers was penalised in the first of three semi-finals as he looked to come through a tough heat featuring Jamaica's Yohan Blake and American Walter Dix.
Only the first two qualified automatically for this evening's final, but Chambers was adjudged to have triggered the false start and therefore followed former world and Olympic 400m champion Christine Ohuruogu in making a shock exit.
Chambers told BBC Five Live: "The rules are the rules and I false-started so its just unfortunate really."
Asked if he thought two false-start disqualifications in two days was a sign there was too much pressure on the British team, Chambers added: "Not at all.
"The pressure is what we have to learn to cope with.
"I knew I had to run beyond my best to qualify and I ended up false-starting."