HMRC has announced that Current or previous tax year P45/Starter Checklist are no longer accepted into their system.
You no longer need to efile any P45/Starter Checklist.
All New Joiner and Leaver must be reported through FPS.

Please click on the followinng HMRC links to read more:-
https://www.gov.uk/new-employee

https://www.gov.uk/employee-leaving