the man you have mentioned is NOT a reputable breeder. The reason he offers nationwide delivery is so that he can bring the puppy to you without you seeing the conditions the pups have been raised in (he lives on a farm) and so that you dont know where he lives if anything goes wrong. There has been cases of puppies from this breeder that have been sick and died :-(
PLEASE dont support puppy farming, this man is a SELF CONFESSED puppy farmer, read the following thread and you will hear from his own lips how he breeds huge batches of puppies for a living and brags about it :-(
http://www.dogweb.co.uk/talkdogs/staffer-any-comments_18563.html