Your locks are going to play a major part in keeping your property safe. They will protect it if someone tries to break in, making it much harder for them to gain access. This is why you should always use British Standard locks.
British Standard locks are identifiable because they have BS in their product names. They are designed to meet with the minimum standards set out for locks in Britain, meaning that they have a guarantee of quality. They will usually come with some degree of guarantee or warranty as well, so they can be replaced for free if anything goes wrong.
Many locksmiths will only agree to fit British Standard locks, as these are the most trustworthy. If your locksmith says they are supplying and fitting a BS lock, you know that they value quality. This is a good indication that the work they do is going to be to a high standard.