Flower, (and yes I know it's off topic)
You are wrong I am afraid. The CAA issued a communication in July that restricts flightdeck access to crew members who are on duty only. This took effect in August for transatlantic flights and recently has been extended to all UK aircraft. CAA operations inspectors have statutory rights to access the flightdeck but apart from that no one else is allowed. Certain exceptions do exist such as manufactures engineers who may be diagnosing a problem with the a/c.
Certain other people will be allowed and as I said a list is being prepared to allow those with a legitmate reason to be there. An ATCO would certainly fall into this catagory I would have thought, someone in your management needs to make some noise to the CAA and insure that you get on the list.