PatrickLondon & yk, thank you for the input. It really does help for me to get at an idea in my head of what I'll be looking at. Getting ready to leave in a few days - thrilled and terrified at the same time! Leave on St. Patrick's Day - hope the pilots are sober. :)
Nancy

Have no fear of asking the clerks at the Tube to help you. I received wonderful service in London.