;

d

leaving a home police force for the purpose of joining NPIA as an employed constable of NPIA and joining NPIA in that capacity, where—

i

not being the chief constable of, or a constable on probation in, that force, the person leaves that force after giving a month’s notice in writing of his intention to do so to the police authority, or such shorter period of notice as may have been accepted by the police authority; or

ii

being the chief constable of, or a constable on probation in, that force, the person leaves that force with the written consent of the chief constable or, in the case of the chief constable, of the police authority of that force; or

e

being an employed constable of NPIA, leaving NPIA for the purpose of joining a home police force as a regular police officer and joining that force in that capacity, where the employed constable leaves NPIA after giving notice of such period as required by the contract of employment of an intention to do so or after giving such shorter period of notice as may be agreed between the employed constable of NPIA and NPIA.