Not all stations are taking it.
Splash FM Worthing aren't. SAGA are supporting it, but not taking the show.
There will be 2, 4min opt outs per hour, which almost all stations are using for local fundraising and travel/news etc. There is a national feed (with nationally based opt outs) on Century Digital on sky and telewest, Capital Life on DAB, and The Hits on Freeview.
More at http://www.ukradioaid.com
Matt Lucas and David Walliams are also hopefully gonna be on.