You need to find out if your LEA will accept an application for a child resident overseas at all (they do not have too, unless Forces etc).
If they won't, then you will only be able to apply once you actually move, and this will almost certainly be treated as a late application and, in practice, this might have no discernible difference from the outcome as an application from a distance of hundreds/thousands of miles away; unless there are schools which allocate by lottery or ones with faith criteria you meet who do not routinely fill their faith places (so you would score one even at huge distance, before the first non-faith applicant).
If a late applicant, or if you do not qualify as an on-time applicant for any of the schools you list as preferences, you can expect to be offered the school nearest to the address you use for applications which has a vacancy (this is why I said it amounts to much the same thing). The UK address is obviously rather more useful for this!
What is considered a 'reasonable' distance varies depending on local geography and transport links, but it shouldn't be more than about 45mins. If it's over 2 miles for an under-8, free transport must be provided for the pupil.
If there are no places whatsoever within a reasonable distance, then there is provision for the LEA to force a school to go over numbers (via the Fair Access Protocol), but I seriously doubt they would do this before the child resides in the borough. Also, you don't get to choose which school in these circumstances, it'll be the LEA deciding which school is best able to cope with an extra pupil.