Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE table_2430014_8 (written_by VARCHAR, uk_ratings__bbc2_rank_ VARCHAR)

### Question ###
Who wrote the episode what had the rating 2.27m (5)?

### Accurate SQL ###

SELECT written_by FROM table_2430014_8 WHERE uk_ratings__bbc2_rank_ = "2.27m (5)"