An in-year admission is when you apply to a school outside the normal admissions round for pupils starting in September. You would normally make an in-year application if you have recently moved, you have arrived from another country or you want to transfer your child from another school.
Applications made to any year group outside the main admissions round should be made directly to the local authority. You can apply for in-year admissions via this link: https://www.ealing.gov.uk/info/201116/in-year_admissions
You will hear the outcome of your application within 15 school days.