This scheme will allow you to claim a taxable grant worth 80% of your trading profits up to a maximum of £2,500 a month. It will be available for 3 months, but may be extended. For more information visit: https://www.gov.uk/guidance/claim-a-grant-through-the-coronavirus-covid-19-self-employment-income-support-scheme
The tax charities TaxAid and Tax Help for Older People can help if you have questions around eligibility and can help with your 2018/19 tax return if you haven't yet submitted it. Go to https://taxvol.org.uk/index.php/coronavirus-support-for-the-self-employed to find out more.