Hi! Lydia Keen from Urban Hair Care London did mine and my bridesmaids for my wedding this summer (2013).
I had 3 bridesmaids and they had quite elaborate hair as their dresses were plain. Mine was more simple as it's really fine, but she suggested some added pieces of hair to bulk it out and I was shocked and delighted at the difference!
She cut and coloured all our hair before-hand too and it was beautiful.
Her site is here: www.urbanhaircarelondon.com