In a lot of YA fiction, extreme/traumatic circumstances seem to bind the characters together in ways that “outsiders” wouldn’t get (likely various levels of PTSD) . In HP you get Voldermort’s attacks and horcrux hunt binding Hermonie and Ron, the Hunger Games binding Katnis and Peeta etc. Coupled with a small enough…

Unfortunately, what you and the legions of racist grans are forgetting is that the majority of non-white people they want rid of are probably third-generation UK citizens…