http://www.screwfix.com/search.do;jsessionid=1LVFIHESETBLSCSTHZOSFFI?_dyncharset=UTF-8&fhsearch=washing+machinehose BB
Or did you mean this: http://www.screwfix.com/prods/25555/Plumbing/Pegler-Brassware/Pegler-Washing-Machine-Tap-15mm-x BB