Ant and Dec are set to quit Britain for America after a furious row with ITV boss Michael Grade this week.

Following crisis talks over the phone vote scandal, Ant and Dec reacted furiously to Grade's description of their executive producers role on hit show Saturday Night Takeaway as a "vanity credit".

A source tells the News Of The World, "It's been a very difficult time with many angry discussions. Ant and Dec were very disappointed with Michael and still are."

According to the report Ant and Dec will quit the show after the next series to concentrate on cracking America instead, despite the fact they recently signed a £27 million deal tying them to ITV until 2009.