From your link, the following replaced the SAP scale for use in the UK
Category A - Images involving penetrative sexual activity and/or images involving sexual activity with an animal or sadism
Category B - Images involving non-penetrative sexual activity
Category C - Other indecent images not falling within categories A or B = SAP level 2 - sex between children or solo masturbation
So "indecent" can include him sleeping with [his] under 18 girlfriend or pics she sent him of her spending some happy time alone, no?
So, yes, I'm still up for lynching the New Puritans that make life-long criminals of children, that remain on the sex offenders register because their under 18 girlfriend sexts them.
On the other hand he could be a monster, but the shout of "paedo" is a slur that never goes away, regardless of the truth