Arla could not be reached for comment yesterday. However, a company spokeswoman previously told thegrocer.co.uk that the vast majority of shoppers were happy with the change, which began last year.
Fonterra, which was unable to comment by deadline, exited the British butter market - once the cornerstone of New Zealand's dairy industry - in 2009 when it sold its share in Arla Foods Fonterra (AFF). At the time, Fonterra said it would continue to license the Anchor brand to Arla.
AFF was established in 2002 to market block butter, spreads and aerosol cream products in Britain, including the Anchor brand.
Dr Mike Lee, a senior lecturer in marketing at the University of Auckland, said it was not surprising customers were confused as established brands were powerful signals.
Proudly British
* Anchor brand is used in the United Kingdom by the European dairy giant Arla.
* Fonterra had supplied butter used in Anchor UK products after licensing the brand to Arla.
* But Arla has now switched production to its British facilities, with many customers noticing the change in taste