More than 200 of the UK's commercial radio stations will suspend their normal programming to broadcast as a single station from 6am to 6pm, attracting an estimated audience of more than 20m listeners from stations owned by Emap, Capital Radio, Chrysalis, GMG Radio, GWR, SRH, Classic Gold and Virgin.
The programme will be produced live from Capital Radio's headquarters in Leicester Square.
Each hour of programming will be hosted by two guest DJs who will introduce live acoustic sets, guest interviews, competitions, auctions, pledges, messages and news breaks.
The effort already has the support from a range of politicians and celebrities including Prime Minister Tony Blair, Real Madrid and England footballer Michael Owen, Jamelia and Mick Jagger.
Mark Story, chairman of UK Radio Aid, said: "I am immensely proud of and grateful to our colleagues across commercial radio who, when asked for an extraordinary response to this disaster, were all in immediate agreement to unite for this very special day."
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