Bruce Oldfield is another extremely noteworthy British designer who creates stunning wedding gowns. His shop showcases 2 lines of dresses, one which comes in normal UK sizes and then altered accordingly, and another that is custom made to order and a bit more expensive.
I went with my friend (who is getting married in less than 2 months OMG!!!!) to try on a number of his dresses in his lovely shop in west London a few months ago and we were both enamored by the materials that his dresses were made with. He had the most beautiful and unique silks and satins that we had seen in all of our trips to bridal shops and also, (major bonus points here) he has awesome dogs.
For more information, see his website here: http://www.bruceoldfield.com/