Screenwriter Ray Galton, who co-wrote the landmark British comedy series “Hancock’s Half Hour” and “Steptoe and Son,” has died at 88. Galton’s family said Saturday that he died Friday evening after a “long and heart-breaking battle with dementia.” […] Galton and (Alan) Simpson wrote “Hancock’s Half Hour” for popular post-war comedian Tony Hancock. Their biggest hit was “Steptoe and Son,” a sitcom about father-and-son junk dealers, which ran between 1962 and 1974. Producer Norman Lear adapted it into the U.S. sitcom “Sanford and Son.” …