So you are both willing to sign a statement that making a hole (of any size and in any place) in a fire door will not adversely affect its fire resistance?
Thats a very brave decision minister!
I'm sure we all know that any hole will comprimise the intergrity of a door in a fire, but the size of the hole will determine the extent to which the integrity has been compromised. you would have to assess each situation on merit, obviously some whacking great big hole excused as a letter box wouldn't be acceptable, but a spy hole would make little difference.
i also agee with the point that, strictly speaking any retro fitting to a door would require the door to be re-certificated.
BUT.... come on lads!! in the real world, would you really enforce the replacement of someone's front door because they put a spyhole in it?
Would that really make a difference to the safety of the building? I personally don't believe it would.
I will now stick my neck out and say, i would never enforce it.