He hosted the show for 9 months solo while Mac hosted a weekend lunchtime slot.
From October 2008 to May 2009, Grimshaw hosted Radio 1's Weekend Breakfast Show.
From 2010–2012, Grimshaw was the main stand-in presenter for Scott Mills on BBC Radio 1.
In November 2012, Grimshaw attracted criticism from Magic Radio breakfast presenter Neil Fox for comments he made about Radio 1's decision to omit Robbie Williams's "Candy" from its A-List playlist – reportedly due to being "too old" for the station's target demographic.
Since 2014, Grimshaw is a regular guest co–presenter on The One Show.
He was selected to mentor the "Boys" category and chose Mason Noise, Ché Chesterman and Seann Miley Moore for the live shows.
In 2013, he narrated Hotel of Mum and Dad for BBC Three.
In 2014, Grimshaw presented The Brits Are Coming, the show that revealed some of the nominees at the 2014 Brit Awards.
The station controller Ben Cooper congratulated Grimshaw saying, "I'm pleased that Grimmy is doing what I've asked of him by keeping his young audience happy and scaring off the over-30s.".
In 2012, Grimshaw had a cameo appearance in the UK release of the Disney film Wreck-It Ralph as Calhoun's deceased fiancé Brad Scott who was killed by Cy-Bugs.
This version, however, is not in the UK home release.
But on his radio show yesterday, Nick gave us a very honest insight into their time together. Grimmy revealed an ‘exclusive’ on his Radio 1 Breakfast Show yesterday (January 17) that Hazza, er, kicked dog shit around his house. One fan wrote: ‘So Nick and Harry hang out and what happened was that Harry kicked some dog poo around and Nick tried new food…
READ MORE SHOWBIZ NEWS He said: “I have an exclusive.
He presented the first ever BBC Switch Awards show with Kimberley Walsh of Girls Aloud on BBC One.