When in London we often take The Tube to move around. Our favourite base in recent years was the Pullman Hotel (photo below) – a great breakfast where you can linger and watch the world go by on the street. The bar also has a similar relaxed vibe.
“St Pancras Station was opened in 1868 and is one of the wonders of Victorian engineering … it is masterpiece `n Gothic Architecture and one of the most elegant stations in the world” (St Pancras – Home Page). -Find more here on history, decay and restoration etc. All fascinating!