Shocking history of violent crimes
Merrett has 20 previous convictions for 38 offences.
Eleven of those offences were offences of violence against a person.
In 2006 he pleaded guilty to resisting arrest the previous November and given a 12-month community order and put on a tag for four months from 7pm until 7am daily.
He also had to pay £75 compensation to the officer, PC David Page.
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In 2007 he was convicted of assaulting Adrian Bartram on January 7 by beating, an offence he had denied.
He was handed a six-month community order alongside a four-month curfew running from Friday to Sunday 7pm until 7am.
He was also ordered to pay £150 compensation and £50 costs.
A year later he was sent to Truro Crown Court after assaulting James Keen causing actual bodily harm in a road rage incident.
He pleaded guilty and was sentenced to 40 weeks' prison, suspended for 15 months and ordered to pay £300 compensation.
He also had to take part in the "aggression replacement" training programme.
Mr Keen was driving along Trelawney Road when he heard a bang and saw his wing mirror hanging off.
He pulled in and suggested to Merrett it was a case of 50-50, but Merrett asked what Mr Keen would do if he punched him.
He then struck Mr Keen, causing a cut above his eye.
In February 2011 he pleaded guilty to attacking his mother Diana in the November of the previous year.
He was given a ten-week prison sentence suspended for a year and ordered to stay in his home for a day, from 7pm on the day of sentence until 7am the next morning.
In August of that year he was back in court after assaulting Richard Lee on June 17.
A restraining order had been put in place until his court appearance not to "enter or loiter" around Park View in Perranwell Station where the victim lived.
The case was dismissed as no evidence was offered.
In October 2011 he appeared at Truro Magistrates' charged with assaulting Andrew Ashton of Wellington Terrace.
He denied the charge but was found guilty and was sent to prison for 26 weeks and given a restraining order against the victim. He admitted committing the offence during the suspended sentence for attacking his mother, but magistrates did not impose any further punishment.