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Jon Culshaw is well-known for his impressions of famous figures, and he's also a keen amateur astronomer. Jon chats about The Sky at Night and dishes up an array of well known voices along the way.

Award winning correspondent Alex Crawford reported from the frontline in Libya and was among the first journalists to report from Green Square in Tripoli as the Gaddafi regime crumbled. She recounts her experiences of the conflict and war reporting in general.

Documentary film maker Morgan Spurlock is known for his films including Supersize Me and The Greatest Movie Ever Sold. He casts an American perspective over British customs, as seen in his TV series Morgan Spurlock's New Britannia.

Plus Dave Wooding and Andrew Gimson join Richard to count down the five most talked about news stories of the past seven days in Chart the Week.