If your child was born between 1 September 2019 and 31 August 2020, and you live in Peterborough you need to apply for a Reception school place.
Visit the following website for more details https://www.gov.uk/schools-admissions
And to apply for a place if you live in Peterborough, please visit the following website https://www.peterborough.gov.uk/residents/schools-and-education/school-admissions/starting-school-in-reception
The online portal is open from 12th September 2023 and you must apply by 15th January 2024.