The policy paper on the extension of the SEISS is available HERE
The key eligibility criteria are that you
The extension will last for 6 months, from November 2020 to April 2021. Grants, which are taxable, will be paid in 2 lump sum instalments each covering a 3 month period. The third grant will cover a 3 month period from 1 November 2020 until 31 January 2021 and will be calculated at 80% of 3 months average monthly trading profits, paid out in a single instalment and capped at £7,500 in total.