Numberblocks support materials are available at this link. Here's what NCETM say:

Numberblocks, first broadcast in January 2017, is a pre-school BBC television series aimed at introducing children to early number.

Snappy animation and loveable characters combine with engaging storylines to gently introduce concepts of number to support early mathematical understanding.

The NCETM materials use each episode as a launch pad. They are designed to assist Early Years and also Year 1 practitioners to confidently move on from an episode, helping children to bring the numbers and ideas to life in the world around them.