The exact time that primary school allocation emails are sent out in the UK can vary depending on the local authority and the school in question. In general, emails are usually sent out in the morning on the designated allocation day, which is usually in mid-April.
It's important to note that while emails are often sent out in the morning, the exact time can vary, and some local authorities may send out emails later in the day. Additionally, some local authorities may send out allocation letters via post, rather than email, so it's important to check the communication method specified by your local authority.
If you're unsure about when allocation emails are due to be sent out in your area, you can contact your local authority for more information. They will be able to provide you with details about the specific allocation process in your area, including when and how allocation notifications will be sent.