The rules are somewhat complicated, i do have a book somewhere, but just the preamble covering strategy is 93 pages long. You need at least 4 players ( unless its queensbury rules where 5 is the minimum and oddly maximum).
Players take it turns to choose stations and try to negotiate they way around a "circuit" of london in a pattern set by the last move by the 1st player.
To counter the "Trafalgar paradox" each adjacent station must be seen as either an unsuitable move or a direct "backsplice" to the opening gambit.
Im sure Markybeau has more to add, but thats the basic outline...the games internal rules are a little more complex to grasp, but well worth persevering.
I believe they run weekend residential workshop courses if your really keen.
Look at it as "Bridge" for the intellectually challenged