Hi Filly
I also decided to be above board with my LEA and let them know we were intending to home educate when my ds got to 5. Biggest mistake of my life! We have got precisely nothing whatsoever from our contact with the LEA. Only years of boring visits, and no help or support. When dd was 5 (10 years later) we got the bumph from the LEA and returned it saying that as they had no reason to believe that we were not providing an education could they please leave us alone now, and to my suprise they agreed - so they have never met dd. Life is much easier without having a yearly visit to worry about, and if you are intending to educate autonomously then it is very hard to present that in a way that ticks their boxes, not impossible as our kids are still learning loads, just not in a conventional manner.
If I were in your situation now, I would not draw myself to their attention. There is no legal requirement on you to notify the LA (they have changed their name this year as they now include welfare and education), the provision of an education is your duty, no one else's.
At the moment there is the "Every Child Matters" agenda coming in, which means that LA's now have to actively track and find out any children missing from education, so they are a bit keener than they have been in the past, but you might still be able to avoid attention, quite legally. We have to get across to the LA's that home educated children are NOT missing from education - they get a little confused and this makes them believe that they have some right to monitor our provision!! Wrong, in law they only have a negative duty to take action only if there appears to be no provision being made. If they believe there is an appearance of no education then they have a right to make informal enquiries, in response to which we only have to supply enough evidence as would convince a reaonable person on a balance of probabilities that an education is being provided. How LA's read this law to make regular home visits, prescribe methods of learning, demanding dated written work, (my son didn't bother with writing until he was 11) and demand a broad and balanced curriculum be followed, I don't know, but they do, so if you can keep out of their way, you might as well