The following organisations can provide a wealth of support for autistic children/adults and their families including online training and workshops:

Autism Central: https://www.autismcentral.org.uk/

Aspens: https://www.aspens.org.uk/annual-review

Autism explained for children by the Neuro Bears: https://www.youtube.com/watch?v=_490q6LaHIY

The PDA Society: https://www.pdasociety.org.uk/i-am-a-parent-carer/resources/helpful-approaches-for-children/

Information on Declarative Language: https://www.declarativelanguage.com/declarative-language-faqs