Question: How many directors worked on the episode with 2.27m (5) is the ratings?
Schema: create table table_2430014_8 (directed_by varchar, uk_ratings__bbc2_rank_ varchar, PRIMARY KEY (directed_by))
SQL: select count(directed_by) from table_2430014_8 where uk_ratings__bbc2_rank_ = "2.27m (5)"