I quite agree with the last couple of posts.
You cannot be over insured when it comes to insuring your life. It is you (the insured) that is the liability as you are not unbreakable and god forbid you (or your family) have to claim it will provide vital extra money and security for your family.
As AdviserRob says too, if you go looking for this same cover inm 5 or 10 years time it will likely to have gone up in price significantly.
Unless you really need to gain back the moneyt that is being spent on the policy I would leave it be. We don't know when we are going to pop our clogs but you can guarantee it won't be a date that suits us and so the more cover you have in place to finance and protect those we leave behind the better