48. All doors will be protected by some form of fingerprint/retinal scanner so that even if somebody knocks out a guard and disguises themselves as one they won't be able to get through the front door.
"Note for Americans and other aliens: Milton Keynes is a new city approximately halfway between London and Birmingham. It was built to be modern, efficient, healthy, and, all in all, a pleasant place to live. Many Britons find this amusing." -Good Omens