I don't know anything about Badger Faces, but in general you are far better to buy registered stock from a reputable dealer, particularly from the minority breeds. The provenance of non-registered stock is effectively unknown, so you could be buying something which looks like the breed you want but has blood from other breeds in it. Once you get to 1/16th dilution, it is difficult to see the admixed blood - for example someone may have used a texel way back on some of his shetlands, then passed the progeny off as purebred. After a while, it will be very difficult to see any texel characteristics, however, genetically they will be in there. Pure breeds are important for the future, each breed preserving certain specific characteristics, such as adaptation to local climatic conditions, rather than there being a hotch-potch generic 'British' breed.
Some breeds which are numerous can be upgraded as described by VSS but many, such as Hebrideans and I think Shetlands, cannot be, so the purity of the breed back since registrations began can be verified.
If you just want to eat your lambs, then there is no point in buying registered stock, and you would be doing nothing to support the breed anyway. But if you want to sell pedigree stock to other breeders, once you have learned enough about the breed to feel qualified to do so, then you would wish that you had started off with pedigree stock in the first place. The thing about selling pedigree stock which you should remember is that only certain lambs are good enough for registration, so you would still have those which didn't make the grade to sell for meat, or as unregistered stock. Which gives a hint, that by buying unreg animals, you could just be acquiring someone else's rejects. They won't taste any different but they will not be good examples of the breed.