J17,
I was an ATCO for more than 10 yrs before I turned to flying. I remember in 1982 when I was working the Upper Heyford RASZ I went on an 18-30 Holiday to Ibiza. (I was the oldest just under the limit, but that's another story) I got the J/S home at 0-dark-30 on the old Air Europe, and experienced a dawn landing into MAN.
Since then, I've always enjoyed my contracts in Europe, as I'm allowed to have "guests" visit as we make our way to their holiday. (as you probably know, this is not permitted in the US)
One limitation I always put on visits, however, is the feelings of my other crew. As has been previously stated, the crew in back has a very hard job, but with a little "pre-arrangement", a visit is almost always possible.
As an ATCO, you have the contacts to make it happen.
I don't work for Britiannia, but I know guys who do. To slag them like you did shows your inexperience in jumpseating, and remember, one day you may be stuck, and these guys may save your bacon. All pilots are more than willing to give ATC'ers a good look, just be cool.
We survive on your largess. It works both ways. Give us pilots another chance.