Labradors! Lovely Labradors.
Show dogs - eg the ones from Jimjoy - are bred for looks; the breeders often breed specifically to develop dogs which will do well in the show ring. They aim for a heavier set dog, with a broader head, shorter legs - stouter all around.
Working bred dogs are bred to refine the specific skills that a labrador was originally designed for. They need to be kind, biddable, keen to please with a fabulous nose, brave, intelligent, fast and with the build to enable them to work all day long.
Probably obvious which type I favour!
BOTH types of breeder can and do fail to work on the temperament of their dogs. The breed should be bullet proof, cheerful, friendly, keen to please and quick to learn.
IMO, an ideal dog for a family would be a carefully bred mix of show and working lines; best of both then. I know of a number of fabulous litters about at the moment if you'd like to be put in touch with the breeders to chat.
There are a number of health tests that are essential in my view; hip and elbow scoring, eye testing, CNM, GPRA and EIC. If a breeder has bothered to have all of those tests done, then they have done the very best they can, taken it seriously and are worth pursuing. I would walk away if they had not been done.
Also, the obvious advice of meeting Mum and getting a good feeling about the set up is vital. Temperament is inherited in large part from parents, but socialisation and 'upbringing' plays a really significant part.
I would expect to pay between about £700 for a pup. Much less than that, and I'd wonder about what had been missed.