For Drones weighing below 250g with out a camera, neither ID is necessary. Having said that, you still really need to comply with the united kingdom’s drone guidelines. Based on the Drone Code, this means protecting visual connection with your drone, flying no better than 120m earlier mentioned the ground, https://www.aeroindustrial.com/webinar-comparando-dji-mavic-3-enterprise-y-phantom-4-rtk/