Unknown individuals thoroughly hurt the feelings of several members of the far-right party, seemingly drawing from its own modus operandi for nuisance-making.
The victims were targeted after the personal details of around 12,000 party members - including doctors, teachers and at least one policeman - were leaked into the public domain.
One anonymous BNP member told the BBC that a caller had warned her to be "very careful" as someone could come to her address - which she correctly inferred as being a threat against her wellbeing.
But she failed to draw parallels between her victimisation and that advocated on her party's website, which urges: "It's time to shut the door and to kick out all immigrant criminals, bogus asylum seekers and anti-Western Islamists."
BNP leader Nick Griffin added to the irony by invoking the Human Right Act in his insistence that party members have a right to anonymity - despite the fact that the BNP opposes EU legislation.