Moving to Brighton in Year 8/9 - nil chance of getting into Dorothy Stringer or Varndean?

[LindsayWagner]

Hello
We want to move to Brighton from E London, but won't be able to do up the house before Oct this year when DS should be transferring to secondary. Does any kind person know what the chances are of getting into DS or Varndean at a later point, if we move into the catchment? Do people move on from there, or once in do they cling on for dear life?

Apols if you've already seen this on Brighton Local board, wasn't sure how active it was.