http://www.weimaraner-association.org.uk/ http://www.weimaranerclubofgreatbritain.org.uk/Members of both these organisations must adhere to a code of ethics/conduct whereby they agree not to mate a bitch prior to 2 years old, or after 7, not to allow a bitch more than 3 litters in her lifetime and members are encouraged to have their stock health checked ie hip scored (breed average 13). They also agree to only breed from sound physical specimens with correct temperament and put the breed before any financial gain.
Do not be tempted to get a puppy from those who merely raise a cash crop.
If you have not had a Weimaraner before I strongly suggest you meet as many people as you can who own one before embarking on ownership, not merely breeders; they are very different to springers!
HTH