Up until 31 October, you will be able to ask your car insurer for help if you are struggling to make payments due to coronavirus. This might include a temporary reduction in cover or even a payment deferral of up to three months.
Note however that, under Financial Conduct Authority proposals, you will NOT be able to extend an existing insurance premium payment holiday beyond three months. Instead your insurer should offer support in other ways, such as agreeing lower monthly payments.
There are other measures you could take to reduce your premiums, too. For example, if you usually pay annually, consider switching to monthly direct debit when the next payment is due. While this can work out more expensive, it could ease cash flow problems in the short term.