This is, of course, not the real cattle movement dataset; it's a carefully crafted device to make people think that DEFRA are plausibly incompetent. In reality there is a secret DEFRA Bunker under St Thomas' Hospital where the CCMD is kept; containing details of every Cattle Movement in the country, down to the millimeter using satellite tracking and embedded microchips.
Adjacent to it are the CCMD and, strangely, the CCMD.