This is from a 2018 Commons Select Committee paper on the future of Policing.
I have just c and p this relevant bit-will try and link to doc.
83.The distribution, dissemination and downloading of indecent images of children (IIOC) accounts for a significant proportion of the police and NCA workload from CSA, and has been described by the NPSCC as a “social emergency”.126 The UK is reportedly the third-largest global consumer of child abuse images, behind the USA and Canada,127 and Chief Constable Bailey told us that the police are “arresting getting on towards 450 men every month and safeguarding almost 700 children” in relation to IIOC alone.128 Between December 2010 and 2017, there was an 1,239% increase in the total number of industry referrals received by the NCA (for example, IIOC found by internet companies on their platforms), and a 102% increase in the number of public reports. This includes criminal behaviour online, as well as indecent images.129
84.As part of our data collection exercise, we asked forces for figures on the number of IIOC incidents recorded locally in the year ending March 2018, as well as the four years previously. When City of London Police’s nominal figures were eliminated, the other forces reported an average increase of 508% between 2013–14 and 2017–18, including notable increases of 1,544% in Durham, 1,954% in Northamptonshire (increasing from 13 to 267), and 916% in Cleveland. Across all forces, the total number of recorded IIOC incidents increased by 424%.
85.Very little is known about the characteristics of online CSA offenders—or about child sex offenders more broadly—but research suggests that between 16% and 50% will go on to commit contact offences,130,131 raising serious questions about the risk to children if CSA offenders continue to have contact with children, either in the family, at work, or as a result of roles within the community. Even these figures may not be reliable, however: Cassandra Harrison told us that research on the relationship between IIOC and contact offending had been contested.132 Regardless of subsequent offending behaviour, it is clear that IIOC offences are serious forms of child abuse in their own right.
Police units who are charged with catching abusers take prosecuting them pretty seriously AFAIK. Don't forget, the police see this shit first hand. They are under no illusions about who these scumbags are.