Tens of thousands of small businesses will receive insurance payouts covering losses from the first national lockdown, following a court ruling.
The Supreme Court found in favour of small firms receiving payments from business interruption insurance policies.
For some businesses it could provide a lifeline, allowing them to trade beyond the coronavirus crisis.
The ruling could cost the insurance sector hundreds of millions of pounds.
The City watchdog, the Financial Conduct Authority (FCA), brought the test case, with eight insurers agreeing to take part in proceedings.
One of the insurers set to make significant payouts is Hiscox, which was challenged by 30,000 policyholders as part of the case.
Richard Leedham, who represented the Hiscox Action Group – on behalf of small businesses, said: “This is a landmark victory for a small group of businesses who took on a huge insurance player and have been fully vindicated.
“What is important now is that Hiscox accepts the Supreme Court’s verdict and starts paying out to its policy holders, many of whom are in danger of going under”.
Other insurers involved in the test case are Arch, Argenta, MS Amlin, QBE and RSA – but as many as 60 insurers sold similar products. They will now pay out on many, but not all, policies.
Huw Evans, director general of the Association of British Insurers, said: “All valid claims will be settled as soon as possible and in many cases the process of settling claims has begun.
“We recognise this has been a particularly difficult time for many small businesses and naturally regret the Covid-19 restrictions have led to disputes with some customers.”