From the DfE site

 

On 1 September 2013, the Education  Regulations 2013 came into force, changing the rules about term-time absence. The amendments remove references to family holidays and extended leave as well as the statutory threshold of 10 school days.

The amendments specify that headteachers may not grant any leave of absence during term time unless they consider there to be "exceptional circumstances" for doing so. If leave is granted, headteachers should determine the number of days a child can be away from school.

 

FAQ From the www.gov.uk website

 

Can a parent take their child on holiday during term time? 
Head teachers should only authorise leave of absence in exceptional circumstances. If a head teacher grants a leave request, it will be for the head teacher to determine the length of time that the child can be away from school.

Leave is unlikely, however, to be granted for the purposes of a family holiday as a norm.