I’ve answered the in-person question on your other thread, but for anyone coming across this one in isolation, the above sweeping statements are not true. It really does depend on the school. From a quick Google:
Pembridge Hall
The admission procedure at Pembridge Hall is non-selective for entry into Reception. There are three classes in Reception and approximately sixty-six places are available for each academic year. Parents must complete a registration form and return this together with the registration fee. Registration is strongly advised within a week of a daughter’s birth as demand for places is high; we do not register babies before they are born. Registration fees are non-refundable.
Registrations are reviewed monthly, in the middle of the month, for the month just completed. All registrations are given equal weight irrespective of when a girl is born within the month. In order to achieve this, the month being reviewed is split into thirds and an equal number of registered parents per third are randomly offered a place for their daughter.
Glendower
Early registration – within a couple of months of your daughter’s birth – is strongly recommended as we are only able to offer a limited number of 4+ assessment slots for the 36 places available each year.
Wetherby
We are currently accepting enquiries for the Reception 2025-2026 entry; for boys born between 1st September 2020 – 31st August 2021.
Registrations are accepted from birth (we do not register babies before they are born). There are a limited number of places on offer so parents are advised to contact the school office as soon as possible after the birth of their son. Registrations are accepted by telephone, e-mail and post. Postal registrations are taken according to the post date on the envelope.
Garden House
The Application Form should be completed after your child has been born and we recommend completing it within a year of birth in order to ensure a place for your child on our Interview List.
Thomas’
Kindergarten - Places are offered in order of registration, whilst ensuring an even spread of birth dates, an even number of boys and girls and our sibling priority policy
Reception - Children may be registered for entry into Reception on 1st September when they are between the ages of one and two years old.
Whereas for Bute House registration for the ballot is two years before entry, and South Hampstead registration for assessment is one year before entry.
Every school is different. Yes, it’s bonkers, but it’s true, some schools do require pretty speedy registration.