Joined a free London walking tour this morning. They have free tours at 11am and 4pm.
Met at Wellington Arch which is just beside Hyde Park metro stop.
Walked to Buckingham Palace

change of guards opposite St. James Park

The walking tour took 2.5 hours and passed by Pall Mall st., Trafalgar square, some Palaces and then Westminster.
Then took a train to cambridge at 2.45pm (20 pounds for 45 mins off peak same day return ticket). There is also another option of taking a bus which is cheaper (around 5 pounds) and slower (2 hours), I took the train because it’s late in the day and Cambridge is just around 80km away from London.
Train to Cambridge

Visited Wei Sing’s dorm and we went to Cambridge University Addenbrookes hospital for his training. While waiting, I took bus Uni 4 to west Cambridge where there are newer buildings for science and engineering.
Physics building

Took another bus to the city,

Cambridge University celebrates its 800 year anniversary this year. It’s one of the oldest university.
An old college

Met my old high school classmate ChinLik who is doing his Phd in neuroscience and we went for dinner.
With the 2 doctors.

Took the last train back to London at 11.20pm. Arrived at King Cross station around 12.30am then walked back to my aunt’s place which is not too far away.