http://www.legislation.gov.uk/wsi/2012/248/contents/made
The Education (School Day and School Year) (Wales) (Amendment) Regulations 2012
School performance and standards
School governance, management and finance
King's Printer of Acts of Parliament
2017-11-28
EDUCATION, WALES
The Education (School Day and School Year) (Wales) Regulations 2003 (“the 2003 Regulations”) apply to schools maintained by local authorities and to special schools (whether or not so maintained). They make provision (among other things) for a school day which is ordinarily to be divided into two sessions (with a break in the middle), and for schools (other than nursery schools) to meet for at least 380 sessions during any school year.