No one has asked you what kind of door you have ... and you have'nt stated it either. So you may be searching in vain.
Is your door wooden or UPVC ?
If it is wooden and you have a mortice lock fitted, then you will find the kitemark stamped on the trim plate that covers the deadbolt.
If you have a UPVC door then you are unlikely to find a kitemark on the side of the door, all you would normaly find is the manufacturers name and model No. of locking system.
You would need to remove the multipoint locking system to see if there is a kitemark on the side of the lock gearbox.
The muti point locking system (when operated by lifting the lever) will have a number of hooks, mushrooms, levers and bolts showing.
Insurance companies will be happy if you have any combination of these, as long as there is 5 of them.
So if your door has 5 or more of these (quite normal) they will be happy with your security.
I struggle with this guidance myself, because regardless of how many locking points you have on a UPVC door. The doors security is only as good as the lock cylinder. If I need to force an entry to a property, I am always pleased to see a UPVC door as they are usualy fairly easy to open without keys.