This week has seen the demise of writer Nicholas Rhea, aka Peter Walker, who wrote the books that formed the basis for the long-running Sunday night TV serial Heartbeat. Set on the North Yorkshire Moors in the 1960s, it was a nostalgic look at a bygone era of policing and community service that lasted for a generation (18 series). In addition to writing over 130 books, Walker was also a prolific columnist, and had a weekly page in my local paper (the Ryedale Gazette and Herald), which was syndicated widely . He was born and brought up on the moors, and had an unrivalled knowledge of their history and folk customs, as well as bringing a detailed perspective on natural history. Locally, he is simply irreplaceable.