![]() Two locks are usually fitted one-third up from the bottom of the door, and one-third down from the top, this spreads the load of an attack. Easy to change if you lose a key or move. ![]() The red-cased 5-lever Union deadlock comes out well on tests and is good value, widely sold. ![]() and a BS mortice deadlock as well, although I expect you will hardly ever use it. I think I'd go for a BS nightlatch on each, which you will use most often. You can also get locks with a "Eurocylinder." They have certain weaknesses and very few are available to meet the BS. I have my back doors and garage suited to one key, as they have the same brand of deadlock. This is very convenient as you only need to carry one key, but it is expensive, and if you ever lose a key you may have to change them all. It is possible to get a nightlatch and a deadlock suited to the same key from one of the premium brands, such as Banham or Ingersoll London Line. they use the nightlatch for convenience, and usually forget or don't bother using the deadlock, except perhaps if they go on holiday. Many people have a BS deadlock, and a nightlatch. If you buy from a local locksmith they may offer advice and fitting, at a cost. They may be cheaper from some specialist lock vendors. It is immune to the common methods of attack. I like the Union 4L67E (it is a Chubb design but the licence to use the trade name expired) but it is very expensive. It is best not to have glass or a letterbox within a metre or two of a nightlatch knob. They are bigger, stronger and more expensive than usual the cylinder is armoured to resist attack and the knob or handle can be deadlocked to prevent an intruder opening the door if they have broken glass or pushed a trained child in through a window or catflap. Most nightlatches aren't, but there are a few that are. You need a British Standard Burglar-resisting BS3621 lock on your main exit door (the one you go out of, so you can't supplement it with any internal bolts). If you are very rich, you can buy Banham.
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