Unless there is an unusual and happy coincidence that the very best stud dog, chosen to improve breed lines, just happens to live in a nearby village I would avoid at all costs.
This doesn't sound to me like a responsible "proper" breeder but a backyard one - someone who has chosen a handy, local nearby local candidate as a stud without regard to the correct selection of the stud.
A reputable breeder will never:
Let you buy without interrogating you about your home, family and lifestyle and knowledge of the breed/dogs in general or without meeting all the family concerned, plus any other dog you may already have and ensuring that you are ALL fully on board with the decision to have a dog.
Advertise in a shop window/free ads/local press. Or Gumtree, Pets4Homes or epupz, all of which are notorious for puppy farmers and shitty backyard breeders. FGS avoid if they do. A reputable breeder should only breed when they have homes lined up in advance as well as a reserve list should any of those potential homes fall through.
Offer anything but original documents proving health checks on both parents.
Breed, as I said, without ensuring that they are maintaining/improving good breed lines.
Suggest that the dogs are KC registered or KC accredited and that therefore they are automatically decent breeders. 90% of puppy farmed and backyard bred dogs are KC reg, it means sweet nothing.
Do anything but ensure that you sign a contract to say that you will return the dog to THEM and not sell or pass on if you ever cannot keep him or if he develops serious health problems which you are unable to deal with, even if thats in 15 years time... and that they will KEEP him and not put to sleep unless he is suffering incurably.
Look out for:
Their local authority breeding license. They don't need one if they breed less than 5 litters in any 12 months (which is all wrong but that's another story!). If they do, call the council and check them out.
They should never breed a bitch under 2 and never repeatedly breed from her or breed her after she's 5 years old. Certainly not breed from her from one season to the next.
They should be able to speak with authority on genetics, breed lines and so on.
Membership of the breed club. Ask if they're members and if so which and check up on them. If not, why not? Alarm bells.
Do they show? Ask for more info and check up.
Ring your local, independent rescues and your Dog Warden and ask them if they know anything about these people.
Google their phone numbers, landline and mobile and also their email address. Ask for these if you don't have them all. See if they are/have advertised any other pups or dogs for sale and if so WHERE they've advertised.
I'm not a Cocker person, love em as I do, so can't advise on all the correct tests which parents and pups should have but please consult the breed club for information on these and ensure that every one is carried out, with original proof and details of the assessing vet - and check with that vet. Vets must ensure client confidentiality but it's always worth trying, some are more accommodating to people in your shoes than others.