Try
http://www.champdogs.co.uk/
Click on Search - then Guided Search - Utilitiy Group - Bulldog
They give you a list of breeders, owners and at the bottom they give you a complete description of the dog including temperament etc.
Make sure you go to a good breeder (preferably one who has a number of dogs and has been in the breed for a number of years).
You should get the pedigree papers (KC reg.) with the pup. Make sure that they have done all the health checks on the parents that are required in the breed.