Hello! We've been through this exact process and went with Anna at Kitchen Connection. Her showroom is on Garratt Lane and I must say we are delighted with our kitchen.
She came to visit to have a "feel" of the house as the Architect drawings dont say the whole story. She listened to us carefully and came with such a great and clever design, we didn't have to change anything.
Even if she had some samples with her, we went to her showroom for more choice. I believed Schuller (German brand) was only doing modern design but they actually do some beautiful shaker kitchen at a reasonable price.
Anna arranged everything, from the design, the units, the worktops, the appliances and more importantly the whole installation. She liaised well with my builder and everything went perfectly well...
Almost 3 years after, our kitchen looks like brand new and we have recommended Anna to many friends.
*little story here: for some reason (no, I'm not accusing my 3yo boy
) our door for our integrated freezer was not very tight. I called Anna and she arranged her fitter to solve this minor issue in the same week. Really delighted with the whole service.