I'd start with Treason but more likely the charges laid after the Mohammed Cartoon Danish Embassy Demo would do for me - inciting racial hatred and soliciting murder - sentences of 4 - 6 years were given.
After disrupting a troops homecoming parade 5 pieces of trash were convicted in Luton in January 2010 with using threatening, abusive or insulting words or behaviour likely to cause harassment, alarm or distress.............. the handwringing Luton Magistrates gave them 2 year conditional discharges and awarded costs against them.