The reporter didn't call Lenny Henry "Ainsley" or "him off Ready Steady Cook", rather that someone in production - who presumably has received a right rollocking - used footage of Ainsley Harriott in a montage made to celebrate Lenny Henry's knighthood. 

While ITV were quick to remove it from their Plus 1 service...

The eagle eyed people of twitter were quick to point out the glaring mistake, bringing it to everyone's attention. 
 

By way of explanation, ITV issued the following statement...

Yikes.