"Rag and bone man is a British phrase for a junk dealer. Historically the phrase referred to an individual who would travel the streets of a city with a horsedrawn cart, and would collect old rags (for converting into fabric and paper), bones for making glue, scrap iron and other items, often trading them for other items of limited value.
There was something I read on Tumblr, where someone related the 9th, 10th, and 11th doctors to the brothers in the Deathly Hallows story. 9 died for power, 10 died for love, and 11 greeted death as an old friend. :D Ahhhhh