thread I liked afternoon tea at Charlotte Street Hotel
https://www.firmdaleho...

Drinks in the restaurant bar at the Tate Modern gives you a good view of the Millenium Bridge and St Pauls https://www.tate.org.u...

Zoo is massively expensive as well, not sure about the Dungeon - maybe keep an eye on Groupon.
permalink It seems you can also get afternoon tea in the Globe
http://www.shakespeare...

which is right by the Tate Modern.