I went into the support tower, through the control room, around the azimuth track. under the 450 ton counterweight, into the "cable wrap," down the spiral staicase in the centre of the structure, past the observation room ("This is where the astronomers work. Don't feed them") past the computer room and out again. Photos to come.
I finished the tour with a steak and Guinness pie and capuccino.
Not a bad way to spend a morning.