ExpeRImental -  http://www.rigb.org/families/experimental

STEM https://www.stem.org.uk/primary-science

PSTT https://pstt.org.uk/

UPD8 http://www.primaryupd8.org.uk/index.php

CLEAPS http://science.cleapss.org.uk/  (for risk assessments)

ASE - https://www.ase.org.uk/resources/primary/