If the children are compulsory school aged and unable to attend school, the LA has a duty under section 19 of the Education Act 1996 to ensure they still receive a suitable full-time education. If the LA isn’t doing that, parents can force them to, including via JR if necessary. The parents don’t have to start EHE if they don’t want.
Other than in the minority of case where full-time provision is not suitable in any form, s19 provision must be full time. A few hours of tuition per week is not that.
The parents could also pursue EOTAS/EOTIS package via an EHCP if it is inappropriate for provision to be made in a school/college as per section 61 of the Children and Families Act 2014. The benefit of this is it can provide far more than s19 provision can.
An increasing number of pupils have s19 provision and EOTAS/EOTIS/C. Equally, LAs will always try to place in a school where possible (and sometimes even when it isn’t). An increasing number are also EHE.
Also to note, s19 provision and EOTAS/EOTIS/C packages cannot compel parents to organise, deliver or facilitate the provision in any way.
I have 2 teen DSs with comprehensive EOTAS/EOTIS packages. A mix of tuition, therapies, other provision, professional time, equipment/tech, subscriptions/memberships, budgets for sundries/resources and for PfA/enrichment/to access the community, etc. and so much more. They both have 2:1 at all times. They have what they have because we pursued an appeal to SENDIST and then enforced the provision.
My DSs’ science education is great. They get experience with experiments, in a lab and otherwise. Some DC with EOTAS/EOTIS/C go on to do science A levels. Some then more on to HE to study a science subject. Some EHE students do the same.
For s19 provision and EOTAS/EOTIS/C, it isn't about DC getting the best possible education or being educated to their maximum potential, there's case law stating so. It is about providing what is suitable, appropriate and reasonably required.