Was the user who created the list "250 Favourite Films" a trialist when he or she created the list?
the user was a trialist when he created the list refers to user_trailist = 1; 250 Favourite Films is list_title;
SELECT T2.user_trialist FROM lists AS T1 INNER JOIN lists_users AS T2 ON T1.list_id = T2.list_id AND T1.user_id = T2.user_id WHERE T1.list_title = '250 Favourite Films'