I just re read the Kent policy and it is a little ambiguous.http://www.kent.gov.uk/__data/assets/pd ... me2015.pdf
KKC clearly state that they only act as a clearing house for the schools. Grammar schools apply their own selection criteria. KCC will only act as principle if the school is under KCC control.
By 5 January 2015 Kent County Council will advise all Kent secondary schools of the full details of all valid applications for their schools via rank lists, to enable them to apply their over-subscription criteria. Only children who appear on Kent County Council’s list can be considered for places on the relevant offer day.
This would therefore assume that if you can get your local authority to confirm a change of address by 5th Jan, they will provide details to schools with you at your new address. The challenge is that you really want to get this done and confirmed prior to Xmas.
Good luck.....but get house hunting now!