John Lennon cartoon
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John Lennon; writer and cartoonist

25 March 2014 Last updated at 11:54 GMT

A collection of poems, drawings and skits by John Lennon is to be auctioned at Sotheby's.

The pictures are being sold by his former publisher Tom Maschler.

Stephen Smith reports for BBC Newsnight.

Original drawings and manuscripts courtesy of the Estate of John Lennon