Reviewed by GREG KINGDirector: Shona AuerbachStars: Emily Mortimer, Gerard Butler, Jack McElhone, Sharon Small, Mary Riggans.For some strange reason, it has taken this absolutely charming film nearly two years to reach our screens.Deaf nine-year-old Frankie (Jack McElhone, recently seen in Young Adam) has never really known his father, a drunken abusive man. Years earlier his mother Lizzie (Emily …