... do I have a legal obligation to let them in and see my child?
I don't know how likely this is to happen, but I had a very odd half-conversation with my neighbour yesterday, asking if my HE provision was 'adequate' and I have an inkling he might report us. He knows very little about us despite being neighbours for 17 years, has no knowledge of ds's experiences in school that led us to HE or the problems he has from his AS, and knows nothing at all about how we're providing for him, but I expect if he does report us the SS will have to look into it whether his concerns are justified or not.
I don't have a problem with LEA contact (we are known to them/registered as home educators), I have a good relationship with our EHE advisor and others and even though I don't agree to our being under the EWO banner I get on well with the Senior EWO who's been involved as well. I'm more than happy to speak with those people but I'm not sure how much contact I'm obliged to have with the SS.
What's the legal position on this?