New passport = IRIS re- registration?

DL the Elder's replacement passport (for the one she lost in IAD a few weeks ago ) has arrived thia am. Will she now need to re- register for IRIS again or will her details just transfer ? She's used the channel regularly, including back at LHR after said journey (which at least saved her the indignity of having to produce the bumph which UK immigration had sent through for her pre departure from IAD :w ).
Thanks.
DL
Thanks.
DL