Speeches at Columbia University with Mayor Bloomberg

Inspiring session with Michael Bloomberg, gently sparring over the relative strengths of our great cities. Have agreed we’re both high on a list of the two best cities in the world. Shamelessly boasted about London’s advantage in terms of universities, theatres, bookshops, Wi-Fi and a number of other fields. But both cities have a shared edge on the core qualities that lift us - energy, enterprise, creativity and a generosity of spirit. Packed hall at Columbia University where I used to sleep through lectures - not because they were tedious but because I was a baby when my mother was here as a student. Today's seminar proved very lively and spending time with Michael Bloomberg has sharpened my vision and resolve to re-establish London as the greatest city on earth when we welcome the world to our Olympics in 2012.

New York Visit - arrival

Just landed in New York - the city where I was born. My good friend Mayor Bloomberg kindly sent two detectives to ease my passage through immigration and the weekend traffic. All talk here is of Derek Jeter - the Yankees captain who has just set a new record with 2,722 hits. The City is also reflecting on the 8th anniversarry of 9/11. My close colleagues in the NYPD have been recaling their own roles clearing the debris at ground zero, and explained how the death toll is still rising because of of illnesses contracted then that are killing some survivors now. Mayor Bloomberg has paid tribute to "the compassion and selfless acts" which helped the city move on. I'll be visiting the British Memorial Garden, launched in 2003 and opened to the public two years ago. 67 obelisks stand in memory of the 67 British citizens murdered that day. A rose, thistle, flax and daffodil reminds us they came from every part of the UK and the motto says it all: "Reflect, remember, rebuild".

New York, New York

Great weekend ahead, back to my birthplace in New York. Looking forward to championing London and saluting its sister city.

It's a pretty packed schedule. I'm going to meet some top actors, glamorous fashion figures and some high powered business leaders. Also spending some time with my good friend Michael Bloomberg, the New York Mayor, and doing a joint session at a prestigious Manhattan Institute conference.

Our cities have much in common and we'll be making some anouncements about joint projects that will benefit us both.