Heathrow Director you need to take a chill pill.
The controller was silly but no lives at risk.
The flight you talk about was in my opinion dangerous as both kids were at the controls and as a passinger I would be unhappy about this. As others have said pre 9/11 flight deck visits were common place and even allowed kids to sit in the pilots seat.
I even think from hearing the audio the pilots found this ammunsing and probably made a dull day just a little more fun.
If you are to liken this to surgery it would bit like the kid passing the surgeon the knife to do the operation.....
When I had my first flying lesson I found ATC to be very difficult to understand this young chap was fairly clear. I also would like to maybe visit the tower at my local airport but I guess that too will be banned.