Officers from Operation Yewtree - the investigation of sex abuse claims surrounding Jimmy Savile and others - arrested the suspect at 7.15am today at an address in Cambridge.
A Scotland Yard spokesman said a man was arrested on suspicion of sexual offences and has been taken into custody locally.
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Scattered showers in the north-west, elsewhere mostly dry and bright.
As Labour's turmoil continues and the Tories deal with the fallout of Brexit, the Lib Dems think they have something to offer voters.
People are invited to share alleged racism or xenophobia stories after Brexit vote to highlight "need for a plan to tackle" social effects.