For Drones weighing fewer than 250g without having a camera, neither ID is important. Having said that, you still really need to comply with the UK’s drone legal guidelines. According to the Drone Code, This suggests protecting visual connection with your drone, flying no better than 120m above the ground, https://www.aeroindustrial.com/webinar-comparando-dji-mavic-3-enterprise-y-phantom-4-rtk/