I was living in London at the time Capital City was first shown in 1989-90. I even worked briefly in the City (at least I think I did - it was on the eastern side of Chancery Lane). Although set in London's equivalent of Wall Street, there's more to it than just 80s yuppie excess - it's more like LA Law, in that it's about a group of people working together, each with their own ambitions, abilities and foibles. Some are hard-driving types (Jimmy, Leonard), while others are wondering what they're doing with their lives in this job (Hudson, Sirkka, Chas). And then there's Max, who's just plain weird, but then he seems to be motivated more by the power and influence money provide, than by money as such.
Seeing it again has unfortunately exposed some of the soap-opera elements (like ending a scene with one character glaring at another) but I remain hooked, and can't wait for series 2 - sadly there were no more after that.