5 Receivables 2018 $000 2017 $000 37 17 3 - 40 17 Debtors 30 23 Total receivables under non-exchange transactions 30 23 Total receivables 70 40 Receivables under exchange transactions Accrued revenue Debtors Total receivables under exchange transactions Receivables under non-exchange transactions The carrying value of receivables approximates their fair value. All receivables have been assessed for impairment and there is no impairment. 6 Payables 2018 $000 2017 $000 Creditors 337 386 Revenue received in advance 100 - 19 19 456 405 Revenue received in advance 80 1 PAYE tax payable 81 161 Total current payables under non-exchange transactions 161 162 Total current portion 617 567 Lease incentive 60 79 Total non-current payables under exchange transactions 60 79 Total non-current portion 60 79 677 646 Current portion Payables under exchange transactions Lease incentive Total current payables under exchange transactions Payables under non-exchange transactions Non-current portion Payables under exchange transactions Total payables Annual Report 2018 69