Right. I'm going to be staying in a hotel by Tower Bridge, arriving there next Wednesday from work. Once I've checked in, I'm going to the DiS thingy. I'll be going back to the hotel that night, and then for the next two days I will be going to a building just by Liverpool St. So, without having to look anything up on t'interweb or anything, I'd like to know...

a) the underground route from Tower Bridge to the DiS thingy, and
ii) the best way from Tower Bridge to Liverpool St. This may be walking, but I'm prepared to risk it.

Thank you in advance