laila,
There are no macrobiotic restaurants in London that I know of,
the closest you will get get would be Fresh & Wild
www.freshandwild.com
the Soho branch has a spacy cafe area.
They have takeaway deli/juice bar, cooked food including organic brown rice.
Or you have the choice of a number of stylish vegetarian restaurants.
In East London where I live, Wild Cherry near the Buddhist Center in Bethnal Green is a nice place to have lunch.
hope you enjoy your stay in London.
