This is Middleton's second conviction for possession of child exploitation material. He was convicted in 2013 and sentenced to one year of intensive supervision community work.
Today he was sentenced for the more recent possession charges, which included objectionable videos depicting sexual abuse and exploitation of children.
He was sentenced to three years in prison and ordered to forfeit all devices. He will be placed on the Child Sex Offender register.
Members of the public concerned they may have seen objectionable material or who want to report a crime can contact the digital child exploitation team.
Where to report crime
If you are the victim of a child abuse crime, Child Abuse: Directory for information and support Safe to Talk: 0800 044 334 Text 4334
If you are concerned about someone else's sexual behaviour, you should contact organisations such as, Safe Network: 09 377 9898 WellStop: 04 566 4745 STOP: 03 353 0257.