"Your father wrote to me a couple of weeks ago, once they’ve had time to process all of the memories returning to them and absorb everything we told them that day.  He told me they plan to return to London.  He also now remembers how attached you were to this cat and asked if I could come and get him for you.  He... we... thought it might be a nice surprise.  While you were – er – occupied – with Corban and Antonin the other night I Apparated to their house to collect him.  Daytime in Australia, you know."  He smirked at her.