On this page there's information about the support groups and parent networks that are available in Hertfordshire that may be able to help and support you or your child.
As well as looking to join some local support groups, finding support online can be a good option.
Most charities will have a Facebook page or Twitter account you could follow. There's also lots of closed parent groups on Facebook that you can ask to become a part of.
You may find that there's lots of information, resources, ideas and help from fellow SEND families online.