Good question
@Nameless and the simple answer is: It all depends on the Certificate they are after.
There are two types of Criminal Records Certificates.
There is the basic regular one that contains crimes committed and sanctions awarded (ie Jail Sentences, Community Service Orders or Fines) or total absence of such.
This particular Certificate does not reflect individual’s total run-ins with the law and certainly don’t record acquittals at first instance or acquittals on appeals.
However there is another type commonly referred to as Enhanced Criminal Record Checks (ECRC), which is more comprehensive and detailed. It is mostly demanded of employees dealing with vulnerable groups, teachers and also by sensitive industries like Police, Banks and Operators of sensitive installations.
With this kind of checks all individual”s dealings with Police (cautions and warnings) and the Courts (sentences and acquittals) are all captured and vividly reported.
Many people feel that it is very unfair to show an individual’s acquittals as it presumes them guilty even after Courts have failed to prove them guilty without a shadow of doubt but there is that need to balance the right to privacy with the superior right for public safety.