Email the Director of children’s services request provision under s19 of the Education Act 1996. IPSEA has a model letter you can use. This should have started long before now. If that doesn’t work email again reminding the LA of their statutory duty and threatening judicial review if they don’t comply. Then, if that fails, you need a pre-action letter which SOSSEN can help with.
Alongside this, check what DS’s absences are being recorded as. They should be authorised, but many find they aren’t. If they are being marked as unauthorised you should challenge them.
If an EHCNA was actually requested in October the LA is in breach of the timescales. They should have informed you if they were going to assess or not within 6 weeks. If they were assessing by now the NA should have taken place and you should know if the LA is going to issue or not and if they are you should have a draft. However, I suspect an EHCNA was actually requested so check this. If one hasn’t been requested use IPSEA’s model letter to make the request yourself. If one has been submitted use IPSEA’s model letter for failure to adhere to the timescales.
Sleepwork thank you. Interhigh seem to be marmite. Some love it and their DC thrive. Others find it doesn’t work for their DC.
Deregistering won’t stop the EHCNA process. But the LA won’t have responsibility to provide s19 provision.
However, if home/online school is your ultimate destination then I don't know what value an EHCP has to you, other than the unlikely event that it covers some of the cost of alternative provisions under an EOTAS. To me, EHCP/EOTAS has little benefit (especially considering the effort and time it takes to secure one) if you are going down that route.
An EHCP can fund online schooling in full. An EOTAS can fund far more provision, including therapies, than the vast majority of parents can afford to fund if they EHE. However, it sounds like OP’s preference is a SS.