DIANE ABBOTT stepped up her criticism of the BBC yesterday over her poor treatment on Question Time last week.

The shadow home secretary was interrupted and “corrected” by the show’s presenter Fiona Bruce for saying that Labour was “level-pegging” with the Conservatives in the polls.

“Fiona Bruce was clearly repeating Tory propaganda that Labour were behind in the polls,” Ms Abbott tweeted.

“If she had said behind in one poll, that would have been [a] different matter.”

Although the BBC initially said it “firmly” rejected any claims of bias, it soon made an embarrassing U-turn.

The BBC said: “A YouGov poll published on the day of the programme suggested a lead for the Conservatives … Diane Abbott was also right that some other polls suggested Labour either as ahead or tied, & we should have made that clear.”

But Britain’s first black female MP was unimpressed. She said: “This is not an apology and does not address all of the issues that have been raised.”