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_4009 ( "Ethnic group" text, "2001 population" real, "2001 %" text, "2011 population" real, "2011 %" text )

### Question ###
What is the highest 2001 population when the ethnic group is white: british?

### Accurate SQL ###

SELECT MAX("2001 population") FROM table_4009 WHERE "Ethnic group" = 'White: British'