After two seasons of finishing with Dagenham in mid-table, Blackett played a part in the Daggers' promotion-winning campaign of 2006–07, but was sold to Peterborough United in the January transfer window, again alongside Mackail-Smith.
After two seasons of finishing near the middle of the table, Blackett contributed to the Daggers' successful campaign that earned promotion in 2006–07, but was sold to Peterborough United in the January transfer window, along with Mackail-Smith.