 In her childhood , she attended Haberdashers ' Monmouth School for Girls , reflecting that " I sort of found my talent there … I was the one who always <unk> off choir , but I had an incredible music teacher who managed to convince me I could do anything . " However , she felt that she " stuck out " by being from a lower @-@ income family than the other girls at the school . At the age of 16 , she moved to Greece with her father " to connect with my heritage and learn to speak the language " and sang Greek folk songs with her grandmother . Having earned an International Baccalaureate at St. Catherine 's British Embassy School in Athens , she returned to Wales two years later . She and her mother then moved to Ross @-@ on @-@ Wye , Herefordshire . " Obsessed with becoming a singer , almost as if it was a disease , " she worked for two months at a petrol station in order to earn money to move to London . 
