Maxangle,
I know this is now going off thread but it isn't the law that says we cannot go in the Jump Seat , it is the companies interpretation of the CAAs directive on cockpit access.
certain companies consider ATCOs as "any other authorised person " which is included on the list allowing access.
However the majority of companies do not. To gain access to the cockpit know involves a long and tortuous procedure.
If ATCOs wanted to do damage to aircraft there are many ways in which we could do it, we are hardly going to do it with us onboard !!!!