Is the pup to be left with your mother? You shouldn't contemplate having a pup, or a dog, alone in the house for hours while you are at work.
The Kennel Club "Find a puppy" service, on their website, is he best place to start, but, obviously, going to a show and asking about puppies and the breed from the people showing is very helpful too. The breed club secretary (Kennel Club again) can also advise, but be prepared for her (it's almost always a woman) giving you a lead to someone who has pups, but who hasn't now but refers you to someone who they know may have some, and so on until you find one about 300 miles from where you are! Dogdom is like that.
Too many people buy a puppy because of how it looks, or because someone famous has one, or because the breed has been in a TV ad, or some such reason, without establishing what the breed is like at home. That's how the breeders can help.