Гугол ответил
School Holiday Start date End date
Christmas holiday 2017 18-12-2017 05-01-2018
February half term 2018 12-02-2018 23-02-2018
Easter holidays 2018 26-03-2018 13-04-2018
Summer break 2018 28-05-2018 01-06-2018
Summer holiday 2018 16-07-2018 05-09-2018
Autumn break 2018 22-10-2018 02-11-2018

Это на 2018 год.
https://www.schoolholidayseurope.eu/england.html