into the stud book? Also how does a young dog get a junior warrant? What advantages does this have? Any answers would be appreciated.

A Junior Warrant will be issued on application by the registered owner at the time of qualification, in respect of a dog that has obtained 25 points between the ages of 6 and 18 months. A minimum of 3 points must be won at Championship Shows where Challenge Certificates for the breed are on offer and a minimum of 3 points won at Open Shows or Championship Shows where Challenge Certificates are not offered for the breed. The scale of points is as follows:
(1) Three points for each First Prize awarded in a Breed Class at a Championship Show where Challenge Certificates were on offer for the breed.
(2) One point for each First Prize awarded in a Breed Class at a Championship Show where Challenge Certificates were not offered for the breed, or at an Open Show.
(3) One point for the award of Best of Breed at an Open Show. Only to be claimed if no Junior Warrant Points were gained by that dog by winning a Breed Class or Classes.
(4) Junior Warrant points cannot be claimed from classes or for awards with less than three dogs of the breed present. In assessing the number of dogs present in each class, exhibitors may count a dog as having been present in a class provided it was entered in that class and was present in its first class for the breed at that Show.
(5) Junior Warrant holders will be awarded a Stud Book Number.
(6) The title "JW" may be used after the name of the dog on Show entries and in catalogues.

Taken from the KC website

a dog also get a stud book number by winning a CC, RCC and by being placed 1st - 3rd in a limit class :)

The following listing is the confirmed Stud Book Bands for 2005.
Please note that Challenge Certificates, Reserve Challenge Certificates and Junior Warrants qualify in ALL BANDS in addition to the class awards as listed. A Stud Book Number is a Crufts Qualification. For a copy of the full Crufts qualifications please telephone 0870 606 6750.
BAND A - 1 ST OPEN CLASS

HOUND GROUP: Bloodhound, Dachshund (Smooth Haired), Dachshund (Wire Haired), Finnish Spitz , Greyhound, Ibizan Hound, Otterhound, Pharaoh Hound.

GUNDOG GROUP: Brittany, Retriever (Curly Coated), Spaniel (Irish Water), Spaniel (Sussex).

TERRIER GROUP: Australian Terrier, Bull Terrier (Miniature), Dandie Dinmont Terrier, Fox Terrier (Smooth), Fox Terrier (Wire), Irish Terrier, Kerry Blue Terrier, Lakeland Terrier, Manchester Terrier, Norwich Terrier, Sealyham Terrier, Skye Terrier, Welsh Terrier.

UTILITY GROUP: Boston Terrier, Japanese Shiba Inu, Schnauzer, Shar Pei.

PASTORAL GROUP : Collie (Smooth), Hungarian Puli, Lancashire Heeler, Maremma Sheepdog, Norwegian Buhund, Polish Lowland Sheepdog, Swedish Vallhund, Welsh Corgi (Cardigan).

WORKING GROUP: Bouvier Des Flandres, Giant Schnauzer, Leonberger.

TOY GROUP: English Toy Terrier, Lowchen, Maltese.

BAND B - 1 ST /2 ND OPEN CLASS

HOUND GROUP: Basenji, Basset Griffon Vendeen (Petit), Dachshund (Long Haired), Dachshund (Miniature Smooth Haired), Norwegian Elkhound.

GUNDOG GROUP: German Wirehaired Pointer, Irish Red & White Setter, Large Munsterlander, Spaniel (Clumber), Spaniel (Field).

TERRIER GROUP: Airedale Terrier, Bedlington Terrier, Bull Terrier, Norfolk Terrier, Parson Russell Terrier, Scottish Terrier.

UTILITY GROUP: Chow Chow, French Bulldog, German Spitz (Klein), German Spitz (Mittel), Japanese Spitz, Keeshond, Schipperke.

PASTORAL GROUP: Belgian Shepherd Dog (Groenendael), Briard, Pyrenean Mountain Dog.

WORKING GROUP: Mastiff, St. Bernard.

TOY GROUP: Affenpinscher, Chihuahua (Smooth Coat), Griffon Bruxellois, Italian Greyhound, Miniature Pinscher.

BAND C - 1 ST /2 ND OPEN CLASS & 1 ST LIMIT CLASS

HOUND GROUP: Basset Hound, Borzoi, Dachshund (Miniature Long Haired), Dachshund (Miniature Wire Haired), Deerhound, Irish Wolfhound, Rhodesian Ridgeback, Saluki.

GUNDOG GROUP: Hungarian Vizsla, Italian Spinone, Spaniel (American Cocker), Spaniel (Welsh Springer).

TERRIER GROUP: Cairn Terrier, Soft-Coated Wheaten Terrier.

UTILITY GROUP: Akita, Bulldog, Miniature Schnauzer, Poodle (Miniature), Poodle (Standard), Poodle (Toy), Tibetan Spaniel.

PASTORAL GROUP: Belgian Shepherd Dog (Tervueren), German Shepherd Dog, Old English Sheepdog, Samoyed, Welsh Corgi (Pembroke).

WORKING GROUP: Bullmastiff.

TOY GROUP: Bichon Frise, Chihuahua (Long Coat), Chinese Crested, Japanese Chin, King Charles Spaniel, Pekingese, Pomeranian, Pug, Yorkshire Terrier.

BAND D - 1 ST /2 ND /3 RD OPEN CLASS & 1 ST LIMIT CLASS

HOUND GROUP: Beagle.

GUNDOG GROUP: English Setter, German Shorthaired Pointer, Gordon Setter, Pointer, Spaniel (English Springer).

TERRIER GROUP: Border Terrier, West Highland White Terrier.

UTILITY GROUP: Dalmatian, Lhasa Apso, Shih Tzu, Tibetan Terrier.

PASTORAL GROUP: Collie (Rough)

WORKING GROUP: Bernese Mountain Dog, Newfoundland, Siberian Husky.

TOY GROUP: Papillon.

BAND E - 1 ST /2 ND /3 RD OPEN CLASS OR LIMIT CLASS

HOUND GROUP: Afghan Hound, Whippet.

GUNDOG GROUP: Irish Setter, Retriever (Flat Coated), Retriever (Golden), Retriever (Labrador), Spaniel (Cocker), Weimaraner.

TERRIER GROUP: Staffordshire Bull Terrier.

UTILITY GROUP: .

PASTORAL GROUP: Bearded Collie, Border Collie, Shetland Sheepdog.

WORKING GROUP: Boxer, Dobermann, Great Dane, Rottweiler.

TOY GROUP: Cavalier King Charles Spaniel.

Only in some breeds in my breed only first and second in Open count for Stud book entry, as it is based on the numerical strength of the breed at Championship shows, they of course also qualify by winning CCs etc :D