Charlotte, you can find most of the products here, although they are at times quite expensive.
TradeSecret, sells a lot of them.
Websites like lookfantastic.co.uk beautyspy.com and hqhair.co.uk sell most of the products as well, sometimes cheaper that the stores.
You can find kiehls, Phytologie, Bumble at Harrods or SpaceNK
I currently use:
Shampoo - Aussie Miracle Moist
COnditioner - Kiehls Cocunut & Lechitin
The only product you will not find here in london is Ouidad, that you will need to order from the states.
But since we are all so nice at this board, when curlies are going across the water they usually post to see if anyone needs anything from there.
hope this helps..