Don't do the LEA any courtesy. Wait for them to contact you.
In addition to Education Otherwise and Muddlepuddle -
Home Education - UK is a good site. Their mailing list often has loads of people discussing the LEA and the many of the LEA - especially up around your way - tend to abuse their power.
www.home-education.org.uk/
Abuse their power? Reject educational philosophies, demand huge packs of work samples, insist on interviewing the children, home visits. threatening SAE's etc. Oh, the horror stories I've read and watched be solved!
But - de-reg right now is very good. There is a law currently being discussed which will allow your children to remain on the register for a period of time. This brings up loads of legal issues for home educators. (Truancy - for one.) So - getting out while it's still easy may be a good thing.
Mike Fortune Wood is an incredible advocate for HE'ers and will often help frustrated or intimidated parents through their initial LEA issues. Sometimes to the point of emailing their Head Of department - only if the family requests intervention. He maintains the HE-UK mailing list.
I learnt a lot from that list when we first moved here from The States. Sorry to be incoherent. DS is ready for a project and clamoring.