Dear all,thanks very much for everyones replies. I really appreciate it.
I have now had a chance to read my policy and there is nothing specific in relation to windows.
What really annoys me is that there is a possability that I will need to pay an excess of 275 Euro and my no claims discount on my next home insurance renewal will be 0%(now at 30%), for damage that I didn't cause.
I am hoping that Claimsman's comment of "My view is that the if the scratches were maliciously caused and in accordance with the policy conditions, the matter was immediately reported to the Gardai then if the OP has a standard household policy, the damage repair cost will most likely be covered by the policy" will be the insurance companies position. Fingers crossed, I will call the insurance company Monday morning.