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59NOTES TO THE CONSOLIDATED FINANCIAL STATEMENTSFOR THE YEAR ENDED 31 DECEMBER 2012(Expressed in Thousands of Trinidad and Tobago Dollars, except where otherwise stated)(Continued)2012 20117. Inventories $ $Raw materials 7,396 6,985Machinery spares 2,017 2,675Goods in transit 155 1,1469,568 10,806Less: provision for obsolescence (1,655) (2,193) 7,913 8,613The amount of write-down due to obsolescence of inventories recognized as an expense is $170 (2011: $211). This expense is included in administrative costs (Note 14).2012 20118. Trade and other receivables $ $Trade debtors 38,592 36,974Less: provision for doubtful debts (6,295) (6,295)32,297 30,679Other receivables 3,777 4,766Amount due from Group companies (Note 19) 1,955 1,19938,029 36,644As at 31 December the aging analysis of trade receivable is as follows: Past due but not impairedTotal Current 30 %u2013 90 days 2012 32,297 15,210 15,000 2,0872011 30,679 12,384 17,961 334As at 31 December 2012, trade receivables at nominal value of $6,295 million (2011: $6,295 million) were impaired and fully provided. Movements in the provision for impairment of receivables were as follows:2012 2011$ $Balance at 31 December 2011 6,295 5,476Charge for the year %u2013 819Balance at 31 December 2012 6,295 6,295>90 daysGuardian_Media_Annual_Report2012.indd 59 4/17/13 7:31 PM