Hi -- I don't think a two year old default that now shows as settled would affect your mortgage application, however the mortgage brokers will probably correct me if I am wrong. !
Creditors are allowed to place defaults in this manner, the only way to get it removed off your file before it naturally expires after six years, is to write to the creditor asking their written permission to have the default removed early by mutual agreement as this is now settled....then forward this letter of agreement onto the relevant credit reference agency(s) for removal from your record.