The law says the LA can make informal enquiries if they have reason to believe an education is not taking place.
Once a LA does make enquiries-which they are now doing- case law says you should give some information, or the LA could decide that there was such a reason.
BUT the way you give the information is entirely up to you.
You can choose whether or not to fill in the booklet. In our LA they send out a four page questionnaire-we chose not to fill it in, instead we said we'd send out an 'Educational Philosophy' (kind of why we do it) and a BRIEF report (saying what we had done, with a list of our resources)
We declined to have a home visit, meet with the LA or have any kind of educational review.
The Home Education Guidelines for LAs where the Governement tells the LA about the law on Home Ed says:
3.6 Some parents may welcome the opportunity to discuss the provision that they are making for the child?s education during a home visit but parents are not legally required to give the local authority access to their home. They may choose to meet a local authority representative at a mutually convenient and neutral location instead, with or without the child being present, or choose not to meet at all. Where a parent elects not to allow access to their home or their child, this does not of itself constitute a ground for concern about the education provision being made. Where local authorities are not able to visit homes, they should, in the vast majority of cases, be able to discuss and evaluate the parents? educational provision by alternative means. If they choose not to meet, parents may be asked to provide evidence that they are providing a suitable education. If a local authority asks parents for information they are under no duty to comply although it would be sensible for them to do so.10 Parents might prefer, for example, to write a report, provide samples of work, have their educational provision endorsed by a third party (such as an independent home tutor) or provide evidence in some other appropriate form.
section 3.13 goes on to say:
Home educating parents are not required to:
teach the National Curriculum
provide a broad and balanced education
have a timetable
have premises equipped to any particular standard
set hours during which education will take place
have any specific qualifications
make detailed plans in advance
observe school hours, days or terms
give formal lessons
mark work done by their child
formally assess progress or set development objectives
reproduce school type peer group socialisation
match school-based, age-specific standards.
so in short, you need to answer their enquiries, but how you do so is entirely up tio you.