For drones weighing lower than 250g without having a camera, neither ID is important. Having said that, you continue to have to comply with the united kingdom’s drone laws. According to the Drone Code, What this means is protecting Visible connection with your drone, flying no larger than 120m earlier https://www.aeroindustrial.com/compra-drones-dji-y-accesorios-en-la-tienda-en-linea-de-aero-industrial/