DJ Dave Lee Travis, real name David Patrick Griffin, has been further charged with two offences of indecent assault on a woman aged over 16.
The alleged offences occurred between January 1992 and December 31, 1993, Scotland Yard said.
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The storms that struck Texas and Oklahoma late on Tuesday brought tornadoes, tennis ball-sized hail and powerful winds.
Samantha Baldwin, 42, and her sons Louis Madge, nine, and Dylan Madge, six, haven't been seen for two days.
A spokesman for the UK Coastguard said it was coordinating a search operation in the Caernarfon Bay area of North Wales.