If you look on the Breed Council website, you can find the number for the pupyp co-ordinator in your area, they will have details of all current or forthcoming litters.
http://www.goldenretrievers.co.uk/application/puppy/index.phpTo get a responsibly, well bred puppy, you'll probably find you have to go on a waiting list before the puppies are born.
Good luck!