The lease does start on the 30th:
Aurigny Air Services Fleet List
Presumably one of G-FBE(J/K/L) currently in storage:
Flybe Fleet List
Or it could be one of the 10 they are withdrawing from service by the end of March.....
I presume they'll do what they have done with the leased ancient West Air Sweden ATR-72 - white tail with tiny Aurigny branding.....