I am on a quest.  I can't claim it has the profundity of a search for the Holy Grail or the philosopher's stone, but to my tongue and stomach, it is a quest of far greater importance.

It is the quest for the best sushi in London...

The Japanese food known to us as sushi is to some a strange and unappetising idea.

The idea of munching on raw fish makes their faces scrunch up in disgust, 'raw fish!' they exclaim, 'how frightful!' and then their monocle falls into their sherry.

But the 'fishy' taste that most people associate with our delicious, silvery, gilled aquatic friends, is actually caused by decay - fresh fish does not smell 'fishy'.

'Sushi' actually refers to the sticky vinegared rice that accompanies the variety of seafood.'Sashimi' is the sliced, fresh raw seafood.  And Sashimi is served very fresh, and expertly filleted.

There is also Bashimi, which is raw horsemeat, but I can't say that my tongue and stomach want to accompany me on that particular quest.

So, where is the best place to get sushi in the grubby, noisy, glittering city of London?