ok great thanks .... so the answer is that yes we needed the 500k each in our accounts for 3 months prior to the date of new extension as that is part of the standard extension requirements.
Sorry we have Visas, the 12 month extension is up in November (within the stamp)
Normally we extend through the kids school for another 12 months, which we need 500k each in the bank account. We have that but only just re-transferred across. We are thinking of moving school so will be transferring the visa to the new school
Question is did we need the 500k in the account for 3 months at time of transfer not when the current 12 months is up