For Drones weighing under 250g and not using a camera, neither ID is necessary. Having said that, you continue to have to comply with the UK’s drone laws. According to the Drone Code, What this means is maintaining visual contact with your drone, flying no increased than 120m higher than https://www.aeroindustrial.com/webinar-comparando-dji-mavic-3-enterprise-y-phantom-4-rtk/