The HMRC Arrest Warrant Scam involves unsolicited automated scam messages left on UK mobiles or landlines. These messages warn that an warrant has been issued for HMRC tax fraud and the only way to avoid arrest is by pressing an automated option, often 1. Anyone who does follow the automated options will be connected directly to one of the scammers.
If you receive a suspicious HMRC call like this then you should hang up immediately, or if it is a message don’t phone back.