b'102 Mercia Asset Management PLC Annual Report and Accounts 2021Notes to the consolidated financial statements continued19. Investments continuedAs at 31 March 2020 the Group held direct investments with an economic interest of 20% or more as follows:Net assets/Interest Held (liabilities) Profit/(loss)% 000 000 Date of financial statementsCrowd Reactive Limited 22.6 683 121 31 December 2018Edge Case Games Limited 21.2 1,942 183 30 September 2019Impression Technologies Limited 25.9 4,402 (2,763) 31 December 2018Intechnica Limited 27.5 3,243 (3,176) 31 March 2019LM Technologies 39.4 119 (383) 31 December 2019Medherant Limited 30.1 1,171 (2,363) 31 March 2019MyHealthChecked PLC (formerly Concepta PLC) 22.4 2,234 (2,150) 31 December 2019nDreams Limited 36.4 (828) (1,510) 31 March 2019Nightingale-EOS Limited 28.5 1,028 (12) 31 July 2019Oxford Genetics Limited t/a OXGENE 30.2 8,945 (3,963) 30 April 2019Soccer Manager Limited 34.8 (2,689) (930) 31 October 2019sureCore Limited 22.0 984 (805) 30 June 2019The Native Antigen Company Limited 29.3 1,835 451 30 September 2019Ton UK Limited t/a Intelligent Positioning 28.2 1,172 (190) 31 December 2018VirtTrade Limited t/a Avid Games 25.8 (3,025) (1,201) 31 August 2019Warwick Acoustics Limited 52.9 2,790 (2,054) 30 September 201920. Trade and other receivablesas at As at31 March 31 March2021 2020000 000Current:Trade and other receivables 599 577Less: expected credit loss allowance (285) (205)Net trade receivables 314 372Other receivables 67 11Prepayments and accrued income 3,679 9154,060 1,298The expected credit losses on trade receivables are estimated by reference to past default experience of the debtors and an analysis of the debtors current financial position, adjusted for factors that are specific to the debtors, general economic conditions of the industry in which the debtors operate and an assessment of both the current as well as the forecast conditions at the reporting date. The Group has defined a default as the failure of a counterparty, including debtors, to discharge a contractual obligation or commitment into which it has entered with the Group.As at 31 March 2021, an amount of 285,000 (2020: 205,000) has been estimated as an expected credit loss allowance in accordance with IFRS 9, in respect of trade receivables primarily from portfolio companies in the managed funds and recorded against revenue in the consolidated statement of comprehensive income. The Directors believe that the credit quality of trade receivables which are within the Groups typical payment terms is good.The ageing of trade receivables is as follows:Year ended 31 March 2021 Year ended 31 March 2020expected creditExpected credit gross loss allowance Gross loss allowance000 000 000 000Not past due 77117 (14)Past due 0-30 days 58 (14) 15 (3)Past due 31-60 days 47 (19) 74 (40)Past due 61-90 daysPast due more than 91 days 417 (252) 371 (148)599 (285) 577 (205)'