Though Clifford Chance has been commissioned to conduct the investigation, the firm's final report will be reviewed by group of senior Tories who will decide how the findings are presented.
Mr Semple told the BBC that he condemned "any alleged negative remarks about another member of the Party that might have been made, without my knowledge, during the National Convention campaign".
Mr Johnson's mother Alison has complained that her family are being treated like suspects in the inquiry.
She told the BBC: "We live out in the backwaters so they probably think if we silence them, they will go away quietly but we won’t.
"I want justice for my son. Every day just drifts into another, we don’t know anything."
She went on: “We also heard that they wanted to interview my husband and myself individually to find out what our stories were. Well its not a story, it’s the facts. Eliot is now gone, we can only deal with the facts."
The Conservative Party said: "We would like to again express our very deepest sympathies to Elliott's family and friends."
The Conservative party has expelled Mr Clarke from the party and started an investigation, which has been handed entirely to law firm Clifford Chance.
Mr Clarke denies any wrongdoing.
• Tatler Tory Mark Clarke 'went back on candidates list' despite bullying claims
Source: http://telegraph.feedsportal.com/c/32726/f/579309/s/4d267067/sc/13/l/0L0Stelegraph0O0Cnews0Cpolitics0Cconservative0C121240A90A0CKey0Ewitnesses0Emay0Eboycott0ETatler0ETory0Eprobe0Bhtml/story01.htm