Radio 4 Extra's Sketch show NewsJack starts next week. A number of writers who've started on NewsBiscuit have had stuff broadcast on this show…
Details of how to submit stuff here…
http://www.bbc.co.uk/programmes/b00kvs8r/features/submission-rules
(and no reason why you can't give them stuff you have submitted to NewsBiscuit - even if it made the front page)