I am asking on behalf of a friend, She has been looking for sometime and is getting confused as they seem to range anything from £350 to £800, Money is not a problem, She is just interested in a healthy well bred puppy, What do others think is a reasonable price.

I would contact the breed club or clubs and ask them what the normal price range is.  I would think the lower price quoted is rather too low (perhaps and older breeder who has lost touch with inflation) but more likely not the best of sources.  The highest figure seems somewhat excessive, but the breed club will tell you what to expect to pay.