You Google any of the following keywords and you will get the best possible choice of kitchens for sale in London.
Cheap Kitchens, Fitted Kitchens, Ex Display Kitchens, DIY Kitchens For Sale London.
I did and was so surprised at just how many kitchen companies are out there.
I finally went for one called,
Home - Really Cheap Kitchens
DIY Kitchens Leeds