Having just had breakfast with the French ambassador the winner is...
Marmite. He said something like zut alours, eef onli wi had nown all sis time, yum yum yum.
He said that it was time to go up market from jam & that the Marmite one was so good that he did not even need to try the others for some reason. He went on to say that he thanks you all for your input and will keep an eye on the forum for even more great ideas any day now.