Unfortunately, moving LAs can bring risks. Some move with no problems at all. Others move and have lots of issues.
When you move with a finalised EHCP the new LA becomes responsible for the EHCP, including the placement named where it is still feasible for the CYP to attend the existing school, on transfer. That is on the day of the move if you give the new LA 15 working days’ notice or it is 15 working days’ from when the LA was informed of the move if you don’t.
If it isn’t feasible for DC to attend the existing placement, the LA is still responsible for ensuring the provision in F is provided and, if they are compulsory school age, a suitable full-time education.
The new LA will review the EHCP. This will happen within 12 months of the previous review or within 3 months of the move, whichever is later. They must inform you when they will hold the review within 6 weeks of transfer. There is the potential they will amend or even propose to cease to maintain. You will get the right of appeal, but it is still something you need to be aware of. If you have to appeal, you can request an expedited hearing. They may also undertake a reassessment of needs.
If posted abroad, you can challenge the LA if they try to cease to maintain. There is case law on this about a DC whose father was in the RN.