Hi,
Personally I wouldn't touch a dog of any breed without a pedigree or KC Registration documents.You have no way of tracing the dogs history & ancesters without these.You have no knowlege of the temperament or any health problems within the lines.What are the Breeders hiding if the pups are not registered with the KC?

I am not familar with Labs but would imagine Working lines would be harder work than show lines,again without papers you wouldn't know where or how these pups have been bred.

To find a Breeder of good health tested Labs you really need to get in touch with the secretary of the Breed Club,(listed below)they will know of litters available or litters due from good reputable recommended Breeders.

Breed Clubs and Societies.

COTSWOLD & WYVERN LABRADOR CLUB. Sec. Mr K Gawthorpe - 01932 874539
EAST ANGLIAN LABRADOR RETRIEVER CLUB. Sec. Mrs J Cole. Tel No: 01354 680375
KENT, SURREY & SUSSEX LABRADOR RETRIEVER CLUB. Sec. Mrs K Walsh. Tel No: 01483 797653
LABRADOR CLUB OF SCOTLAND. Sec. Miss Farquarson. Tel No: 01382 459099
LABRADOR RETRIEVER CLUB. Sec. Mr A Ellis. Tel No: 01766 522146
LABRADOR RETRIEVER CLUB OF NORTHERN IRELAND. Sec. Mrs Hughes. Tel No: 028926 38603
LABRADOR RETRIEVER OF WALES. Sec. Mrs M Barker. Tel No: 01443 842585
MIDLAND COUNTIES LABRADOR RETRIEVER CLUB. Sec. Mrs J Lewis. Tel No: 01484 680123
NORTH WEST LABRADOR RETRIEVER CLUB. Sec. Mrs Maureen D’Arcy. Tel No: Not available, please contact the Kennel Club.
NORTHUMBERLAND & DURHAM LABRADOR RETRIEVER CLUB. Sec. Mr P A Smith. Tel No: 01642 292965
THREE RIDINGS LABRADOR CLUB. Sec. Mrs P Gill. Tel No: 01943 467926
WEST OF ENGLAND LABRADOR RETRIEVER CLUB. Sec. Mr G Cox. Tel No: 01566 785121
YELLOW LABRADOR CLUB. Sec. Mrs Wiles. Tel No: 01895 823227