When buying a new car you often receive two keys. If you have an older vehicle or have purchased it second hand, you may not have been given a spare and therefore you will have to ensure that you look after it well. Having just the one key that you reply on can be risky as not only can you lose it which will be extremely costly to call someone out and make a new key (not to mention time consuming) but also it may become damaged or faulty rendering it useless.
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Many insurance companies are now offering key cover which will pay out if you lose or damage your key and need to get a replacement or possibly even the locks changed.