British National Party leader, Nick Griffin, claims that a "joker" has amended the BNP political broadcast which features an image of a Marmite jar.
Marmite is beginning legal action against the BNP and said the far-right party had not asked their permission to use the image.
The jar featured in the top left-hand corner of a video shown on the BNP's website. At the end of the video, next to the party's logo, the slogan "Love Britain, Vote BNP" was written - a spin off from Marmite's advertising slogan "love it or hate it".
In a statement, the firm said: "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."
Defending their political broadcast on Thursday, Mr Griffin said: "The official broadcast contains no mention or images of Marmite at all. The clip shown last night on the BNP website is essentially the actual broadcast, but apparently one of the people to whom we had given the broadcast to review inserted the Marmite jars in reaction to the disgraceful smear advertising campaign being run by Unilever, which smeared and spoofed the BNP and its Euro 2009 TV broadcast."
Attacking Unilever, the multinational company who own Marmite, he added: "Although we are not responsible for whoever it was who inserted the Marmite jars into the internet version of the broadcast, we do see the amusing side. If Unilever want to make a scene of it, we will ensure that from now on all of our media spokesmen will appear with jars of Marmite."
The video was publicly available on the BNP's website but now appears to have been removed. It is still available on YouTube.
