can anyone help...

i am currently on a mercy dash to london...travelling parents who are now in hospital over here.....phew is that a story in itself....
i have two weeks in london and am having trouble locating yarn and fabric/craft stores...
what i really want, is to access some japanese pattern books/fabric etc...
if anyone knows of a good shop can you reply to me...
in the mean time i'll keep searching the streets...
see you at home shortly....