The Government have now published the guidance we need to follow regarding the school closures. If you intend on keeping your child at home, you do not need to do anything further. 
The Government’s key principle:

If it is at all possible for children to be at home, then they should be.
If you believe you are one of the ‘critical workers’ stated in:
and you are unable to keep your child at home as one or both parents work in a ‘critical’ role, please email before 12 noon today with:

•your full name/s
•your child’s name/s
•your job title/s
•employer’s name/s
•the hours/days that you are at work;
or telephone us if you do not have access to email.
As per the guidance, in order to prevent the spread of the virus, we can only offer a limited number of places. These will be offered on a priority basis. Therefore, there may not be places for everyone who applies. 
We will get back to all parents as soon as we can after 3pm today, to let you know if we can offer you this service during the school closures.
Thank you for your understanding and support during these unprecedented times