nBBC Radio 4's flagship topical panel discussion programme chaired by Jonathan Dimbleby , returns tonight. The new series covers what could turn out to be a general election year and many cabinet ministers and senior figures from industry and the arts are already booked to appear. Tonight, Dimbleby is joined at the Science Museum in London by panellists including Charles Kennedy , leader of the Liberal Democrats; Janet Street-Porter , editor of the Independent on Sunday; and Lord Waldegrave. Producer Lisa Jenkinson. Repeated Saturday 1.15pm