Return the names of singers who are from UK and released an English song.
SELECT artist_name FROM artist WHERE country  =  "UK" INTERSECT SELECT T1.artist_name FROM artist AS T1 JOIN song AS T2 ON T1.artist_name  =  T2.artist_name WHERE T2.languages  =  "english"
singers from UK refers to country = 'UK'; released an English song refers to languages = 'english'; joining of artist and song tables on artist_name to filter based on both country and language;