A "depraved" former teacher jailed for 20 years for raping runaway teenage boys has had an appeal against his conviction thrown out.
Graeme Andrew Joblin, 56, groomed vulnerable young boys he met while busking in Christchurch city centre.
He plied them with alcohol and drugs before taking advantage of them by raping and indecently attacking them.
In 2012, he was jailed for 20 years at Christchurch District Court, with a minimum non-parole term of seven years, after being found guilty by jury on 23 charges.
Judge Farish told him: "This offending could be described as depraved in the extreme".