For drones weighing fewer than 250g with no camera, neither ID is critical. That said, you still must comply with the UK’s drone rules. Based on the Drone Code, What this means is retaining Visible contact with your drone, flying no higher than 120m over the bottom, being a minimum https://www.aeroindustrial.com/por-que-el-dji-matrice-4t-es-el-futuro-de-las-operaciones-industriales-con-drones/