For drones weighing below 250g with no digital camera, neither ID is necessary. That said, you still should comply with the UK’s drone guidelines. According to the Drone Code, This suggests preserving Visible connection with your drone, traveling no larger than 120m over the bottom, being at the least 150m https://www.aeroindustrial.com/compra-drones-dji-y-accesorios-en-la-tienda-en-linea-de-aero-industrial/