user: Question: What is the highest 2001 population when the ethnic group is White: British?
Columns: ['Ethnic group', '2001 population', '2001 %', '2011 population', '2011 %']
Types: ['text', 'real', 'text', 'real', 'text']
Sample row: ['White: British', 42747136.0, '87.0', 42279236.0, '79.8']
SQL:

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