A good place to start would be the Parliamentary Voting System and Constituencies Act 2011.
And this could not be amended if Parliament chose to do so?
Nowhere in the speech delivered to the Tory Party Conference does it say the words "we think are wrong" without the next clause in the sentence. He mentions the word wrong twice.
Parliament only gets one mention: "So, right now, we’re passing a new law through Parliament,"
"For violent and sexual offenders… we’re ending the automatic half-way release from prison."
Whether the second sentence runs on from the first, is not clear.
So subsequently he writes an article in the Telegraph and decides that he said something else.
Even so, who is to decide what better lawyers than him decide the law means is interpreted wrongly? I can stand by the statement that some laws are badly drafted and need amending. But he didn't say that.