Thats it really. Am about to buy buildings and contents insurance and the buildings side of it has an 'accidental damage' standard plus option.
Except that I can't really think of an occasion where I'd need it, unless I perhaps accidently broke the lock on the door, in which case I doubt I'd claim anyway.
Have read policy booklet and that doesnt really give me any other indication of what this is for - I'm not a DIYer so I wont be 'accidently' knocking down a wall or drilling through somewhere that causes mass destruction...