In-year applications are processed by the school. You can apply for an in-year place up to four school weeks before the place is needed. If you are offered a place, the school will require your child to start at the school within four school weeks. Exceptionally, parents seeking an in-year place starting in September can apply from the previous May. 

Here is the link to the online form:

https://www.hants.gov.uk/educationandlearning/admissions/applicationprocess/inyear

Further information about admissions can be found in the guidelines and policies below: