While Baker goes on holiday the celebrities will take turns sharing the microphone with DJ Gary Crowley.
First up is 'The Apprentice' cast-off Lucinda Ledgerwood for three days from August 18.
Winehouse, who will guest on September 1, is, according to the BBC, a "regular listener to 94.9 and a friend of the station", as are Daniels and 'Fame Academy' vocal coach David Grant.
The full line-up is:
August 18-20 - Lucinda Ledgerwood
August 22 - Katie Melua
August 26-27 - Phil Daniels
August 28-29 - Toyah Wilcox
September 1 - Mitch Winehouse
September 2-3 - Clare Grogan
September 4 - Sandie Shaw
September 5 - Alison Moyet
September 8 - Sharleen Spitteri
September 9-12 - David Grant
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