There are several offences which can be charged.
Possessing extreme pornography
The maximum sentence is 3 years or 2 years where the image in question is not an image which portrays a) an act which threatens a person’s life, or b) an act which results, or is likely to result, in serious injury to a person’s anus, breasts or genitals.
Indecent images of children
There are several offences involving indecent images of children including:
1) Criminal Justice Act 1988 s 160 (possession of indecent photographs) – max sentence 5 years
2) Protection of Children Act 1978 s 1 (taking, distributing, publishing etc. indecent photographs) – max sentence 10 years
3) Coroners and Justice Act 2009 s 62 (possession of prohibited images of children) – max sentence 3 years
Assessing the material
The material is assessed on a scale of 1-5 as to the severity of the images. This helps the judge decide how serious the offence is and what sentence should be imposed.
The scale runs from 1 to 5 and was established in R v Oliver 2002 EWCA Crim 127.
(1) images depicting erotic posing with no sexual activity;
(2) sexual activity between children, or solo masturbation by a child;
(3) non-penetrative sexual activity between adults and children;
(4) penetrative sexual activity between children and adults;
(5) sadism or bestiality.
Other principles / points of note
Pseudo-images are generally considered to be less serious as real photographs, but they can be just as serious.
92 images at level 4 and 5 is to be considered a large amount (R v Wakeling 2010 EWCA Crim 2210)
Reference should of course be made to the guideline.