Not exactly the Royal Throne, but not surprisingly there was a private lavatory for the Queen built into the Royal Waiting Area.
Here we see the wash hand basin.
Note the beautiful stained glass in the windows - necessary of course for the privacy for Queen Victoria.
Thou didst leave thy throne and thy kingly crown,
when thou camest to earth for me;
but in Bethlehem's home was there found no room
for thy holy nativity.
O come to my heart, Lord Jesus,
there is room in my heart for thee.
Heaven's arches rang when the angels sang,
proclaiming thy royal degree;
but of lowly birth didst thou come to earth,
and in great humility. Refrain
The foxes found rest, and the birds their nest
in the shade of the forest tree;
but thy couch was the sod, O thou Son of God,
in the deserts of Galilee. Refrain
Thou camest, O Lord, with the living word
that should set thy children free;
but with mocking scorn and with crown of thorn,
they bore thee to Calvary. Refrain
When the heavens shall ring, and the angels sing,
at thy coming to victory,
let thy voice call me home, saying "Yet there is room,
there is room at my side for thee." Refrain