{"entry-date":"2026-03-28","start-date":"","end-date":"","entity":42214813,"name":"Black Jacks Cottage","dataset":"listed-building-outline","typology":"geography","reference":"LB1080256","prefix":"listed-building-outline","organisation-entity":167,"geometry":"MULTIPOLYGON (((-0.495087 51.602688, -0.495246 51.602688, -0.495246 51.602646, -0.495086 51.602646, -0.495087 51.602688)))","point":"POINT (-0.495166 51.602667)","quality":"authoritative","notes":"II","description":"Black Jacks Lock, Harefield","listed-building":"1080256"}