7 On 7 November 2006 Mr Doherty emailed a bill of costs to Mr O'Brien, claiming a sum totalling $40,489.72. On 12 December, Mr Rafter sent a letter to Mr O'Brien demanding repayment of a sum that Mr Rafter claims to have contributed to the joint venture. On 25 January 2007, Mr Doherty filed an application for assessment of his bill of costs, together with a notice to lodge objections. Notices were duly forwarded to the costs-respondent, Mr O'Brien, requiring that any response to the application be filed by 15 February. On 19 February, Mr O'Brien wrote to the Manager Costs Assessment, requesting an extension of a further 14 days. That request was referred to the appointed costs assessor, Mr Salier, who on 5 March 2007 sent a notice to Mr O'Brien requesting a response within 21 days. None was forthcoming, and on 15 May 2007 the assessor sent a further notice to Mr O'Brien, in mandatory terms, requiring a response within a further 14 days. In the absence of any such response, the assessor assessed the bills essentially on a default basis and on 16 July 2007 issued the certificate in a sum of $39,079.62. The Manager Costs Assessment notified Mr O'Brien of the issue of the certificate of assessment. Mr Doherty caused that certificate, as he was entitled so to do, to be registered in the Local Court at Kogarah on 26 July, whereupon judgement was entered for $39,148.62.