Hi Patricia, Lablover seems to have covered most of it. As suggested, go to as many shows as you can, the Championship shows are best, since you will meet breeders from most of the UK. Open shows tend to be restricted to the locality.
Would you be prepared to buy a pup around 3 - 4 months old rather than 8 weeks? Show breeders tend to keep the best pups for themselves and run them on for a few months. All the changes that happen in conformation and pigmentation dont really take place until the 3 month mark and this is the time that the a breeder will be moving on show stock. A show breeder may keep 3 or 4 pups from a litter if they are showing show potential, but obviously cannot keep all of them, it is at this stage they will tend sell only to people who wish to show. There are still no guarantees, but the odds are more in your favour.
Do you know what you are looking for in a show dog? ie; conformation, shoulder angulation, stop, stifle, topline, tailset etc. Dont be fobbed off by a breeder saying the pups are champion quality. Do your research. Most show breeders will be only to willing to help. Also the top price does not guarantee the top dog. And never be frightened to ask too many questions. We all started at the begining.
That said about the breeder, you asked what to look for.
The pup.
General Appearance, Stongly built, short-coupled, broad skull, broad and deep through chest and ribs, broad and strong over loins and hindquarters
Head and Skull
Skull broad with defined stop, clean cut without fleshy cheeks, jaws of medium length , powerful not snipey. nose wid, nostrils well developed.
Eyes, medium sized expressing intelligence brown or hazel
Ears, not large or heavy hanging close to head and set rather far back
Mouth, Jaws and teeth stong with a perfect, regular and complete scissor bite.
Neck, Clean strong powerful set into well placed shoulders.
Forequarters, Shoulders long ans sloping. Forelegs well boned and straight from elbow to ground when viewed from eighter front or side.
Body, chest of good width and depth, with well sprung barrel ribs. Level top line. Loins wide short coupled and strong
Hindquarters. Well developed, not sloping to tail, well turned stifle, hocks well let down, cow hock highly undesirable.
Feet, round compact well arched toes and well developed pads.
Tail, Distictive feature, very thick towards base, gradually tapering towards tip, medium length, free from feathering but clothed thickly all round with short thick dense coat, thus giving rounded appearance described as 'otter' tail, may be carried gaily but should not curl over back.
Gait/movement. Free, covering adequate ground; straight and true in front and rear.
Coat. Distinctive feature, short-dense without wave or feathering, giving fairly hard feel to the touch
Colour. Wholly balck, yellow or chocolate. Yellows range from light crearm to fox red.
Size Ideal height at withers; dogs 22-22.5 ins. bitches 21.5ins.
Faults. Any departure from the foregoing points should be considered a fault and the seriounsess with which the fault should be regarded shoud be in exact proportion to its degree.
Male animals should have two apparently normal testicles fully descended into the scrotum.
Excuse spelling mistakes, I have not gone back and checked
Good luck
HTH
Kay