A police constable has called for guaranteed time behind bars for those who assault officers after a teenager who slammed his head into a patio avoided jail.
Pc Darren Jenkins was left with facial injuries that shocked his family after Riley Hope smashed his head into a patio and punched him in the face, breaking his nose.
The teenager had crashed a moped into a concrete post during the morning rush hour in Leyton, east London, in January.
As officers moved in to arrest him he ran off, with Pc Jenkins giving chase and finding him hiding in a conifer bush.
In the ensuing struggle, Hope repeatedly punched the constable and hit his head on the paving slabs.
Hope was given a six-month prison sentence suspended for two years, and 200 hours unpaid work.
Pc Jenkins is still unable to work because of his injuries.
He claimed that Hope could have run off after punching him, but instead stayed to inflict more violence.
Despite his injuries he continued to try to chase the suspect, until he was told by a sergeant to get medical help, and was left "in shock" at the sight of his injuries.
Hope escaped onto a nearby roof, but was eventually caught by the police and London Fire Brigade.
Pc Jenkins, who is based in Walthamstow, east London, added:
Metropolitan Police Federation Chairman Ken Marsh said the leniency of Hope's sentence made a mockery of the legislation.