As this video preview confirms, the brutal inter-station comedy smackdown that is Stand up for Comic Relief is under way. Six of the BBC's national radio networks are represented this time; Radio 4 by Woman's Hour legend Jenni Murray and the others by various presenters I can't quite bring myself to name (this, remember, is the Radio 4 blog).

Each has taken a crash course in the indelicate art of stand-up comedy with a big name mentor from the comedy world and, at 1830 this coming Wednesday you can hear their live sets in front of an audience at London's Comedy Store on Radio 4. Then, from 1900 on the same day (right after the programme), you'll be able to see videos of all six sets on the BBC's Red Nose Day web site and (this is the important bit) the lines will open for you to vote for the one you thought best. Let battle commence.

Steve Bowbrick is editor of the Radio 4 blog

The three-episode chronicle of the six presenters' unlikely journey to the stage at the legendary Comedy Store starts tomorrow evening at 1830 on Radio 4. Listen to all three episodes for seven days after transmission on the Radio 4 web site.

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Stand up for Comic Relief - the contenders