Marmite is beginning legal action against the British National Party after an image of a Marmite jar was used on a political broadcast without its permission.
The jar featured in the top left-hand corner of a video shown on the BNP's website.
The firm said: 'It has been brought to our attention that the British National Party has included a Marmite jar in a political broadcast shown currently online.
'We want to make it absolutely clear that Marmite did not give the BNP permission to use a pack shot of our product in their broadcast.
'Neither Marmite nor any other Unilever brand are aligned to any political party.
'We are currently initiating injunction proceedings against the BNP to remove the Marmite jar from the online broadcast and prevent them from using it in future.'
The video was publicly available on the BNP's website this morning but now appears to have been removed.
The Marmite jar appeared in the top left-hand corner of the screen when party leader Nick Griffin was addressing viewers in the BNP's general election broadcast.
Current advertising for Marmite is based around the slogan 'love it or hate it' - an idea the BNP appears to have been trying to adopt.
Marmite is owned by multinational company Unilever, whose other brands include PG Tips, Knorr and Vaseline.