Curriculum guidance for professionals and families is available from partner SI organisations.
These are free of charge and can be downloaded from their websites.
For example:
NDCS: https://www.ndcs.org.uk/
Helping Your Deaf Child to Develop Maths Skills (5-11 Year Olds)
As part of our NatSIP/NDCS supporting achievement publications there is also
Supporting the achievement of deaf children who use English as an additional language (EAL)