Currently, parents of children under the age of 17 (18 if they are disabled), have been able to request flexible working arrangements from their employer. However, a change in the law taking effect from 30th June will mean that all employees with 26 weeks’ continuous employment will be able to make a request.
http://www.birkettlong.co.uk/site/library/legalnews/flexible-working-from-30-june-2014.html
