Have a look on lovely lab advice centre. It is full of labrador adorers who have a massive mine of information to tap into - they also have clear information on health problems to be aware of, and the meaning of hip and eye scores which are usually mentioned when you're buying a pup.
My bugbear are those who breed dogs for show - show dogs are bred for a different set of reasons to working dogs and are often bred with an emphasis on refining a visual standard, in my opinion often at the expense of the other important elements of labs.
Although it is only my opinion, I feel quite strongly about it and would avoid buying a show strain dog because I don't feel that they are a true reflection of the breed and don't necessarily maintain the wonderful lab temperament and attitude.
Working dogs are far more robust in body are lighter in structure and are bred for intelligence. loyalty and bidability rather than looks. I feel the working strain of lab is truer to the labrador character standard which I adore.
I know there will be millions of people who disagree with me but I do feel very strongly about it and have chosen my beautiful girls accordingly.
There is a fabulous lab breeder in West Sussex who piles great care and thought into her breeding - I can email you the contact details if you like. I also have a wonderful, wonderful trainer in Hampshire who is not expensive, gives one on one training and is just fabulous. She made an enormous difference to us!
I have 2 wonderful labs - both black. I don't think you could be looking for a better sort of dog.
Oh yes - and when you view puppies, make sure you see them with their Mum and if you feel even a little uncomfortable about their set up, their breeder or in fact anything at all WALK AWAY.