It is important that any support put in place should be evidence based.
This document reviews interventions and their effectiveness: what works for children with literacy difficulties
When considering interventions, it is important to consider whether there are significant developmental gaps that need to be addressed before putting something formal such as phonics recovery in place.
The Northern Alliance phonological awareness screening tool can be used to see whether there are developmental gaps and the developmental continuum contains click on links to support each stage: https://highlandliteracy.com/emerging-literacy/phonological-awareness/