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1.
Surname of British comic actor (Chris Langham) convicted of downloading child pornography hence
To do a Langham - to download kiddie fiddler flicks

Also charged with, but not convicted of, attemtped buggery on a minor (alledged to have attempted to take an underage female up the wrong 'un in a hotel shower)
Hence definition two:

To do a Langham - to attempt to take a girl up the wrong 'un
Shannon Matthews' 'step father' was arrested for doing a Langham.

She was on the rag so he did a Langham
by Roystrongisabitstrange April 02, 2008