I have lots of respect for the AAT program and its qualifications the junior accounting staff I have taken on over the years if AAT qualified are always good. What is seems particularly helpful is building the basic knowledge – strangely stronger accountancy qualifications such as ACCA or CIMA don’t always do that. My theory is that AAT students spend more time on the basic tasks and hence become better at them.
The AAT website
We have a blog post on something like the same lines here. Though this is talking more about a variety of certification programmes including legal workers administrative tasks and making a choice on which provider to use being wary particularly of online scams.