I wouldn't be at all happy about this, especially if what you know of this woman isn't good. My DS has returned several official-looking letters to a bank recently, clearly marking on them that the addressee was not known there. Still they kept on coming. Fortunately, my little DGS tore the last one open. It's a very serious demand for a substantial sum owed by this unknown person to the bank. Without knowing that, how could my DS ever have begun to sort this out?
Boris Johnson referred to the police for suspected further breaches of lockdown regulations.