Taking time off work: For new and expecting parents
What if I change my mind about when I want to start my leave?
If you change your mind about when you want to start your leave, you must give your employer a new letter telling them this.
If you want to start your leave earlier, you must give your employer the new letter at least 2 weeks before you want your leave to start.
If you want to start your leave later, you must give your employer the new letter at least 2 weeks before the date you originally said your leave was going to start.