Barn mentioned him in B+W eps. When asked about who the cousin was that Barn lived with while on the outskirts of London. Now research showed that Bradford was a Londoner who died in the 1830s. In the original storyline the vampire became one in the 1820s ( not 1795). They will never fully explain who this Mr. Bradford really was in connection to the Collins family. Seems very doubtful he was a real relative of theirs. Empirical evidence suggests that the Collins family of 1820 had deals with a prosperous London merchant named Nile Bradford and that is where Barn quickly thought of him when asked with whom he lived with in the UK.