For drones weighing less than 250g with no digital camera, neither ID is important. Having said that, you continue to need to comply with the UK’s drone legal guidelines. Based on the Drone Code, What this means is protecting Visible connection with your drone, flying no increased than 120m earlier https://www.aeroindustrial.com/webinar-comparando-dji-mavic-3-enterprise-y-phantom-4-rtk/