Does the April 2012 increase in the qualifying period for unfair dismissal claims from one to two years apply retrospectively?

No, the qualifying period for unfair dismissal claims increased from one year to two years on 6 April 2012, but only for employees whose employment begins on or after that date.

The requirement for one year's continuous employment continues to apply to employees who have been employed since before 6 April 2012, until there is a break in their continuity of employment.