I'm considering moving abroad at some point in the future and wanted to see what would appear on an ACRO Police Certificate that some countries ask for as part of the Visa and Residency process. I found an interesting document, located here
which suggests that the 'step down' model was updated in January 2018. Stepping down is the process where at some point, certain cautions and offenses will no longer be displayed on a Police Certificate for immigration purposes, and what would instead be shown is 'No Live Trace' rather than 'No Trace'. The significant change here from what I can see is that sexual and violent non-custodial dispursals seem to now be eligible to be stepped down.
Unless I have missed this before, it now seems that even for the most serious offenses (category A) that resulted in no custody being served, the longest time period before it is stepped down is 20 years. For less serious offenses (those in categories B and C), the step down timeframe is 15 and 12 years respectively. If the outcome was a caution, then the step down timeframes is 10 years for category A and 5 years for categories B and C.
This seems a positive step forward, particularly for those who fall into the non-custodial (caution) area for things such as image offenses, as it means that the Police Certificate will in the first instance state 'No Live Trace' rather than giving all the details of the offense and outcome. Of course, any embassy is then going to ask for more information, however there must be some weight applied to the fact that ACRO regard the offense as eligible to not be directly disclosed anymore after a period of time and should allow for you to at least achieve an interview to explain the situation rather than have an online rejection.