Mortice locks come in various grades, ranging from your basic 2 or 3 lever for internal doors or cupboards and even sheds. 5 Lever motice locks can also come in different grades including British Standard (BS). These locks are embedded in the door for extra strength, providing exceptional security and specified by most insurance companies. 

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For your front door and back door, British Standard (BS 3621) 5-lever Locks are an Insurance requirement, the latest being BS 3621:2007, because of the higher security they provide.  They can be fitted in conjunction with a Night latch on your front door and a 5-lever BS on your back door. 

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Ideally, two forms of lock on the front, a 5 lever mortice lock and a night latch, either one being of the latest kite-marked British standard version, but the very minimum is one.