Hi @Gaffer2000
You might be able to receive a goodwill gesture as a means of refund for the 24 hours loss of service if you speak to Billing, however you wouldn't be due automatic compensation for being without a broadband service for 24 hours.
Info below from
https://www.virginmedia.com/help/billing-and-payments/automatic-compensation
Your broadband or fixed phone line aren’t working at all?
Check to see if there’s an outage in your area on our handy service checker. You can report the issue to us by registering it online or alternatively, calling us. If we haven’t fixed the fault within 48 hours from the end of that day, you will be entitled to £8.40 credit per day until it’s sorted.
Once you’ve reported the issue to us and service has been fully restored, any credit owed will be automatically calculated and applied to your bill – so there’s no need to call us to credit you.
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