To be fair, there are so few barbets in Britain that I tend to lean towards advising to import, this afterall can only be good for the very small gene pool if one intends to breed . Likewise for the PWD, a drop of new blood wouldn't go amiss!
Grooming this type of dog may well be another consideration for
a re-think, having seen photos of a full fleece being shorn off as brushing and combing had either not been done or not been successful, it is obviously not a job that everyone can cope with.
Our own pup now has a lovely longish coat, but having been through the nightmare experience with Odo and his coat in his early years, I am ready for this little girl! Nelly on the other hand came to us beautifully groomed and at an age where the awful puppy coat had been trimmed off, and she has always remained much easier to groom with her easier to manage coat, not quite wash and go, but much more so than Odo.
Lastly, not all the dogs can manage the claims that you find they are advertised as doing. Some may come from a line that is particularly renowned for hunting/retrieving, some don't, but a dog with a high prey drive, may not really fit in with what you want the dog to do, or it may well get bored with the training! You may have to change what activities you had planned to partake in to counter this. Some may have very little actual barbet blood in them, and some.... even though the name implies, just do not have an affinity with water!