BBC Radio 1 has announced a major shake-up of its weekday schedule, promoting Fearne Cotton to the morning show.

Cotton will replace Jo Whiley on the Monday to Friday morning show at the national top 40 station.

The show airs 10am to 12.45pm. Cotton previously co-hosted the Sunday chart show. The Live Lounge, in which acts perform live and cover other artists, continues as part of the show. Whiley, who presented the show for eight years, will now have a weekend show at 1-4pm on Saturday and Sunday.

"Jo [Whiley] is leaving very big shoes for me to fill and it's nerve wracking. She has been a massive inspiration to me throughout my career so I have a high standard to live up to," said Cotton in a statement. "The live music legacy will live on in the new show and I can't wait to get started."

Whiley said that the "time has come to move on" and she added that live music will also have a place in her new show.

Other changes include Greg James, currently the early weekday breakfast host from 4am to 6.30am, taking over the 1-4pm weekday slot from Edith Bowman, who will now present the weekend breakfast show.

"This is our first big shake-up of the weekday schedule for over five years," said Radio 1 deputy controller Ben Cooper in a statement.

Andy Parfitt, controller, Radio 1, added: "BBC Radio 1 must continue to change to connect with a new generation of audiences and this is a significant move, promoting three of our up-and-coming broadcasters into the heart of the schedule.

"We're doing this from a position of strength, we have record audience levels, delivered with major contributions by Jo and Edith and I thank them for that."

The changes take effect from Sept. 21.

Radio 1 increased its audience reach from 10.6 million in Q4 2008 to 11.1 million in Q1 2009, according to official audience research figures by RAJAR.