Hi,

I am arriving at 9:35 am on March 3rd via AA and departing from STN airport at 8:15 pm to Germany. While I am in London, I am planning to kill time (4-5 hours) doing some sightseeing and meeting one of my friend at liverpool street station around 2:30pm for a lunch. As per my understanding, it will take anywhere from 2-3 hours to get to Central London after arrival (1-2 hour for immigration) and an hour traveling time to Central London. I will be taking a London underground to central London. Now I need some opinions on how to best utilize my time before departing via STN airport.

Here is I am planning to do, Take a tube to Tower hill and do some sightseeing (1-2 hours) and go to Liverpool station around 2:30 pm.

Also What are the options for me to go to STN airport from liverpool street station. I am assuming I need to be there at least 2 hours before my departure, so I am planning to leave around 4:00 pm (or is it still late ?) . I already looked at the service (STN express and National bus service from Liverpool street stations) and there is a price difference of around 10 GBP. Is the bus service reliable or I should either leave earlier or completely avoid it. I am also seeing another cheap option to go STN from Bakers Street via easybus (~ 5 GBP), same question, how reliable is this easybus service?
http://www.londontoolkit.com/travel/...ed_easybus.htm

Thanks for any suggestions on sightseeing and will be really appreciated.