Links
https://www.thekennelclub.org.uk/
You will find a whole wealth of information on the Kennel Club's website, it's a great place to start if you're thinking of getting a dog, looking for clubs to join, training facilities and so much more.
http://thejackrussellterrierclub.weebly.com/
This is the website for the Jack Russell Terrier Club, for KC registered Jack Russell Terriers in the UK. The club are friendly and welcoming of new members, are able to put you in touch with other Jack Russell Terrier breeders, and more.
Champdogs is a great website as a directory for many different breeders. You can find litters registered here for sale, information on dogs, pedigrees and much more. I always recommend buying a puppy from a reputable breeder, you can never do too much research before considering getting a puppy.
Home of the Caldbeckjack Kennel, Dotty's breeders based in Cumbria, UK. They have some fantastic information on the history of their Jack Russell Terrier Bloodlines and Denise is always happy to answer questions and offer advice.
http://www.rutaarojacks.co.uk/
A wonderful show and breeding kennel based in Yorkshire with top quality KC registered Jack Russell Terriers