CREATE TABLE table_15077 ("Episode" TEXT, "First aired" TEXT, "Entrepreneur ( s ) " TEXT, "Company or product name" TEXT, "Money requested  ( \\u00a3 ) " FLOAT, "Investing Dragon ( s ) " TEXT)

how much money was requested on the show which aired on 4 september 2011?
SELECT SUM("Money requested (\u00a3)") FROM table_15077 WHERE "First aired" = '4 september 2011'
SELECT SUM("Money requested (\u00a3)") FROM "table_15077" WHERE "First aired" = '4 september 2011'