It is easy...

From Holborn station you take Picadilly line and change at Green Park to Jubilee, they told me.

Piece of cake!

I also remembered at Green Park there are elevators to go up or down, as it is also a line going to Heathrogh Airport's new terminal 5.

Yes, but....

Between the two elevators a long long long corridor! And I was already tired. Happy enough, my legs did not hurt, this time but still it seemed a long way.

This photo was taken looking back at the trajectory already accomplished.

Been there, done that.