I am surprised that New Ireland won't let you reduce your level of cover. Maybe with the older plan, their computer system doesn't allow for a reduction? I don't really know.
I doubt it is a reviewable contract, these are a lot more flexible, so you would be able to reduce the policy.
I ran a quick quote for you for €150,000 cover for a 55 year old. Cover for 10 years is €199 a month.
And don't worry about how much you have paid. We don't add up how much we pay for our house or car insurance over the years. We just hope we never to claim on it. Same with life and critical illness cover. The only time you'll see a pay out is if you are extremely sick or dead!!
Steven
http://www.bluewaterfp.ie (www.bluewaterfp.ie)