A review of ITV phone-ins has identified a "serious cultural failure" within the company.

Shows including Ant and Dec's Gameshow Marathon and Saturday Night Takeaway were among those involved, an audit of ITV's output has found.

ITV executive chairman Michael Grade described the findings as "horrible" and "inexcusable".

Ant McPartlin said he and co-host Dec Donnelly were "extremely disappointed" their Takeaway show was singled out.

"We'd like to make it clear that we had no idea these problems existed," he continued.

"Ant and I are now reassured that strict measures have been put in place to ensure that these kind of incidents can never happen again," said Donnelly.