Holborn is on the junction of the Piccadilly (Purple) Line and Central (Red) Line. Holborn is an area of Central London.
I was there on this occassion because I have just joined the North London Reading Group (Group 17).
We were meeting in the Bung Hole, a pleasant wine bar just off the main road. It was an interesting evening, we decided that we would read Graham Greenes "The End of the Affair" - I last read it when I was in my early twenties and can't remember a single thing about it!