Stuart Hall watched via video link from Preston prison as Lord Chief Justice Lord Judge announced that a term of 15 months imposed last month was "inadequate".
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Undivided, which represents more than 4 million young people, has set out its top issues in an open letter to political leaders.
John Wombell, 58, was jailed for eight weeks after admitting making the grossly offensive call to the Broxtowe MP's office last November.
A late April chill with a cold northerly wind